Generated by SassMeister.com.

SassMeister-input-HTML.html

<style>
  .column,.columns{
    background: #DDD;
    text-align: center;
    border-radius: 4px;
    font-size: 1rem;
    text-transform: uppercase;
    height: 30px;
    line-height: 30px;
    margin-bottom: .75rem;
    font-weight: 600;
    letter-spacing: .1rem;
  }
</style>

<div class="container">

  <h2>Current Offset Method</h2>
  <p>This result matches the behavior of skeleton CSS exactly (for a column-margin of 4%). The offsets don't seem to line up with the grid nicely or fill the entire width - perhaps this is the intended behavior, but it's not what I expected</p>
  <div class="row">
    <div class="one column">one</div>
    <div class="one column">one</div>
    <div class="one column">one</div>
    <div class="one column">one</div>
    <div class="one column">one</div>
    <div class="one column">one</div>
    <div class="one column">one</div>
    <div class="one column">one</div>
    <div class="one column">one</div>
    <div class="one column">one</div>
    <div class="one column">one</div>
    <div class="one column">one</div>
  </div>
  <div class="row">
    <div class="two columns">two</div>
    <div class="two columns">two</div>
    <div class="two columns">two</div>
    <div class="two columns">two</div>
    <div class="two columns">two</div>
    <div class="two columns">two</div>
  </div>
  <strong>Offset examples</strong>
  <div class="row">
    <div class="one column">one</div>
    <div class="offset-by-one one column">one</div>
    <div class="one column">one</div>
    <div class="offset-by-one one column">one</div>
    <div class="one column">one</div>
    <div class="offset-by-one three columns">three</div>
    <div class="one column">one</div>
  </div>
  <div class="row">
    <div class="one column">one</div>
    <div class="offset-by-five one-half column">one-half</div>
  </div>
  <div class="row">
    <div class="offset-by-one two columns">two</div>
    <div class="offset-by-one two columns">two</div>
    <div class="offset-by-one two columns">two</div>
    <div class="offset-by-one two columns">two</div>
  </div>

  <hr>
  <h2>Altered Method</h2>
  <p>A minor modification to the calculation of offsets - the columns now all line up and behave as I would expect (for any column-margin)</p>
  <div class="row">
    <div class="one column">one</div>
    <div class="one column">one</div>
    <div class="one column">one</div>
    <div class="one column">one</div>
    <div class="one column">one</div>
    <div class="one column">one</div>
    <div class="one column">one</div>
    <div class="one column">one</div>
    <div class="one column">one</div>
    <div class="one column">one</div>
    <div class="one column">one</div>
    <div class="one column">one</div>
  </div>
  <div class="row">
    <div class="two columns">two</div>
    <div class="two columns">two</div>
    <div class="two columns">two</div>
    <div class="two columns">two</div>
    <div class="two columns">two</div>
    <div class="two columns">two</div>
  </div>
  <strong>Offset examples</strong>
  <div class="row">
    <div class="one column">one</div>
    <div class="offset-by-one-B one column">one</div>
    <div class="one column">one</div>
    <div class="offset-by-one-B one column">one</div>
    <div class="one column">one</div>
    <div class="offset-by-one-B three columns">three</div>
    <div class="one column">one</div>
  </div>
  <div class="row">
    <div class="one column">one</div>
    <div class="offset-by-five-B one-half column">one-half</div>
  </div>
  <div class="row">
    <div class="offset-by-one-B two columns">two</div>
    <div class="offset-by-one-B two columns">two</div>
    <div class="offset-by-one-B two columns">two</div>
    <div class="offset-by-one-B two columns">two</div>
  </div>
  
</div>

SassMeister-input.scss

// ----
// Sass (v3.4.11)
// Compass (v1.0.3)
// ----

/*
* Skeleton V2.0.4
* Copyright 2014, Dave Gamache
* www.getskeleton.com
* Free to use under the MIT license.
* http://www.opensource.org/licenses/mit-license.php
* 12/9/2014
* Sass Version by Seth Coelen https://github.com/whatsnewsaes
*/

// Table of contents
//––––––––––––––––––––––––––––––––––––––––––––––––––
//- Grid
//- Base Styles
//- Typography
//- Links
//- Buttons
//- Forms
//- Lists
//- Code
//- Tables
//- Spacing
//- Utilities
//- Clearing
//- Media Queries


// Variables
//––––––––––––––––––––––––––––––––––––––––––––––––––

// Breakpoints
$bp-larger-than-mobile    : "min-width: 400px" !default;
$bp-larger-than-phablet   : "min-width: 550px" !default;
$bp-larger-than-tablet    : "min-width: 750px" !default;
$bp-larger-than-desktop   : "min-width: 1000px" !default;
$bp-larger-than-desktophd : "min-width: 1200px" !default;

// Colors
$light-grey: #e1e1e1 !default;
$dark-grey: #333 !default;
$primary-color: #33c3f0 !default;
$secondary-color: lighten($dark-grey, 13.5%) !default;
$border-color: #bbb !default;
$link-color: #1eaedb !default;
$font-color: #222 !default;

// Typography
$font-family: "Raleway", "HelveticaNeue", "Helvetica Neue", Helvetica, Arial, sans-serif !default;

//Grid Variables
$container-width: 960px !default;
$container-width-larger-than-mobile: 85% !default;
$container-width-larger-than-phablet: 80% !default;
$total-columns: 12 !default;
$column-width: 100 / $total-columns !default; // calculates individual column width based off of # of columns
$column-margin: 4% !default; // space between columns

// Misc
$global-radius: 4px !default;

// Functions
@function grid-column-width($n) {
  @return $column-width * $n - ($column-margin*($total-columns - $n)/$total-columns);
}

@function grid-offset-length($n) {
  @return grid-column-width($n) + $column-margin;
}

@function grid-offset-length-altered($n) {
  @return grid-column-width($n) + $column-margin * 2;
}

// Grid
//––––––––––––––––––––––––––––––––––––––––––––––––––

.container {
  position: relative;
  width: 100%;
  max-width: $container-width;
  margin: 0 auto;
  padding: 0 20px;
  box-sizing: border-box;
}

.column,
.columns {
  width: 100%;
  float: left;
  box-sizing: border-box;
}

// For devices larger than 400px
@media (#{$bp-larger-than-mobile}) {
  .container {
    width: $container-width-larger-than-mobile;
    padding: 0;
  }
}

// For devices larger than 550px
@media (#{$bp-larger-than-phablet}) {
  .container {
    width: $container-width-larger-than-phablet;
  }
  .column,
  .columns {
    margin-left: $column-margin;
  }
  .column:first-child,
  .columns:first-child {
    margin-left: 0;
  }

  .one.column,
  .one.columns          { width: grid-column-width(1);  }
  .two.columns          { width: grid-column-width(2);  }
  .three.columns        { width: grid-column-width(3);  }
  .four.columns         { width: grid-column-width(4);  }
  .five.columns         { width: grid-column-width(5);  }
  .six.columns          { width: grid-column-width(6);  }
  .seven.columns        { width: grid-column-width(7);  }
  .eight.columns        { width: grid-column-width(8);  }
  .nine.columns         { width: grid-column-width(9);  }
  .ten.columns          { width: grid-column-width(10); }
  .eleven.columns       { width: grid-column-width(11); }
  .twelve.columns       { width: 100%; margin-left: 0;  }

  .one-third.column     { width: grid-column-width(4);  }
  .two-thirds.column    { width: grid-column-width(8);  }

  .one-half.column      { width: grid-column-width(6);  }


  // Offsets
  .offset-by-one.column,
  .offset-by-one.columns       { margin-left: grid-offset-length(1);  }
  .offset-by-two.column,
  .offset-by-two.columns       { margin-left: grid-offset-length(2);  }
  .offset-by-three.column,
  .offset-by-three.columns     { margin-left: grid-offset-length(3);  }
  .offset-by-four.column,
  .offset-by-four.columns      { margin-left: grid-offset-length(4);  }
  .offset-by-five.column,
  .offset-by-five.columns      { margin-left: grid-offset-length(5);  }
  .offset-by-six.column,
  .offset-by-six.columns       { margin-left: grid-offset-length(6);  }
  .offset-by-seven.column,
  .offset-by-seven.columns     { margin-left: grid-offset-length(7);  }
  .offset-by-eight.column,
  .offset-by-eight.columns     { margin-left: grid-offset-length(8);  }
  .offset-by-nine.column,
  .offset-by-nine.columns      { margin-left: grid-offset-length(9);  }
  .offset-by-ten.column,
  .offset-by-ten.columns       { margin-left: grid-offset-length(10); }
  .offset-by-eleven.column,
  .offset-by-eleven.columns    { margin-left: grid-offset-length(11); }


  .offset-by-one-third.column,
  .offset-by-one-third.columns  { margin-left: grid-offset-length(4);  }
  .offset-by-two-thirds.column,
  .offset-by-two-thirds.columns { margin-left: grid-offset-length(8);  }

  .offset-by-one-half.column,
  .offset-by-one-half.column   { margin-left: grid-offset-length(6);  }


  // Offsets
  .offset-by-one-B.column,
  .offset-by-one-B.columns       {
    margin-left: grid-offset-length-altered(1);  
    &:first-child{
      margin-left: grid-offset-length-altered(1) - $column-margin;
    }
  }
  .offset-by-two-B.column,
  .offset-by-two-B.columns       {
    margin-left: grid-offset-length-altered(2);  
    &:first-child{
      margin-left: grid-offset-length-altered(2) - $column-margin;
    }
  }
  .offset-by-three-B.column,
  .offset-by-three-B.columns     {
    margin-left: grid-offset-length-altered(3);  
    &:first-child{
      margin-left: grid-offset-length-altered(3) - $column-margin;
    }
  }
  .offset-by-four-B.column,
  .offset-by-four-B.columns      {
    margin-left: grid-offset-length-altered(4);  
    &:first-child{
      margin-left: grid-offset-length-altered(4) - $column-margin;
    }
  }
  .offset-by-five-B.column,
  .offset-by-five-B.columns      {
    margin-left: grid-offset-length-altered(5);  
    &:first-child{
      margin-left: grid-offset-length-altered(5) - $column-margin;
    }
  }
  .offset-by-six-B.column,
  .offset-by-six-B.columns       {
    margin-left: grid-offset-length-altered(6);  
    &:first-child{
      margin-left: grid-offset-length-altered(6) - $column-margin;
    }
  }
  .offset-by-seven-B.column,
  .offset-by-seven-B.columns     {
    margin-left: grid-offset-length-altered(7);  
    &:first-child{
      margin-left: grid-offset-length-altered(7) - $column-margin;
    }
  }
  .offset-by-eight-B.column,
  .offset-by-eight-B.columns     {
    margin-left: grid-offset-length-altered(8);  
    &:first-child{
      margin-left: grid-offset-length-altered(8) - $column-margin;
    }
  }
  .offset-by-nine-B.column,
  .offset-by-nine-B.columns      {
    margin-left: grid-offset-length-altered(9);  
    &:first-child{
      margin-left: grid-offset-length-altered(9) - $column-margin;
    }
  }
  .offset-by-ten-B.column,
  .offset-by-ten-B.columns       {
    margin-left: grid-offset-length-altered(10); 
    &:first-child{
      margin-left: grid-offset-length-altered(10) - $column-margin;
    }
  }
  .offset-by-eleven-B.column,
  .offset-by-eleven-B.columns    {
    margin-left: grid-offset-length-altered(11); 
    &:first-child{
      margin-left: grid-offset-length-altered(11) - $column-margin;
    }
  }


  .offset-by-one-third-B.column,
  .offset-by-one-third-B.columns  {
    margin-left: grid-offset-length-altered(4);  
    &:first-child{
      margin-left: grid-offset-length-altered(4) - $column-margin;
    }
  }
  .offset-by-two-thirds-B.column,
  .offset-by-two-thirds-B.columns {
    margin-left: grid-offset-length-altered(8);  
    &:first-child{
      margin-left: grid-offset-length-altered(8) - $column-margin;
    }
  }

  .offset-by-one-half-B.column,
  .offset-by-one-half-B.column   {
    margin-left: grid-offset-length-altered(6);  
    &:first-child{
      margin-left: grid-offset-length-altered(6) - $column-margin;
    }
  }


}

// Base Styles
//––––––––––––––––––––––––––––––––––––––––––––––––––
// NOTE
// html is set to 62.5% so that all the REM measurements throughout Skeleton
// are based on 10px sizing. So basically 1.5rem = 15px :)

html {
  font-size: 62.5%;
}

body {
  font-size: 1.5em; // currently ems cause chrome bug misinterpreting rems on body element
  line-height: 1.6;
  font-weight: 400;
  font-family: $font-family;
  color: $font-color;
}

// Typography
//––––––––––––––––––––––––––––––––––––––––––––––––––

h1, h2, h3, h4, h5, h6 {
  margin-top: 0;
  margin-bottom: 2rem;
  font-weight: 300;
}

h1 { font-size: 4.0rem; line-height: 1.2;  letter-spacing: -.1rem;  }
h2 { font-size: 3.6rem; line-height: 1.25; letter-spacing: -.1rem;  }
h3 { font-size: 3.0rem; line-height: 1.3;  letter-spacing: -.1rem;  }
h4 { font-size: 2.4rem; line-height: 1.35; letter-spacing: -.08rem; }
h5 { font-size: 1.8rem; line-height: 1.5;  letter-spacing: -.05rem; }
h6 { font-size: 1.5rem; line-height: 1.6;  letter-spacing: 0;       }

// Larger than phablet
@media (#{$bp-larger-than-phablet}) {
  h1 { font-size: 5.0rem; }
  h2 { font-size: 4.2rem; }
  h3 { font-size: 3.6rem; }
  h4 { font-size: 3.0rem; }
  h5 { font-size: 2.4rem; }
  h6 { font-size: 1.5rem; }
}

p {
  margin-top: 0;
}

// Links
//––––––––––––––––––––––––––––––––––––––––––––––––––

a {
  color: $link-color;
  &:hover {
    color: darken($link-color, 5%);
  }
}

// Buttons
//––––––––––––––––––––––––––––––––––––––––––––––––––

.button,
button {
  display: inline-block;
  height: 38px;
  padding: 0 30px;
  color: $secondary-color;
  text-align: center;
  font-size: 11px;
  font-weight: 600;
  line-height: 38px;
  letter-spacing: .1rem;
  text-transform: uppercase;
  text-decoration: none;
  white-space: nowrap;
  background-color: transparent;
  border-radius: $global-radius;
  border: 1px solid $border-color;
  cursor: pointer;
  box-sizing: border-box;
}

input {
  &[type="submit"],
  &[type="reset"],
  &[type="button"] {
    display: inline-block;
    height: 38px;
    padding: 0 30px;
    color: $secondary-color;
    text-align: center;
    font-size: 11px;
    font-weight: 600;
    line-height: 38px;
    letter-spacing: .1rem;
    text-transform: uppercase;
    text-decoration: none;
    white-space: nowrap;
    background-color: transparent;
    border-radius: $global-radius;
    border: 1px solid $border-color;
    cursor: pointer;
    box-sizing: border-box;
  }
}

.button:hover,
button:hover {
  color: $dark-grey;
  border-color: lighten($dark-grey, 33.3%);
  outline: 0;
}

input {
  &[type="submit"]:hover,
  &[type="reset"]:hover,
  &[type="button"]:hover {
    color: $dark-grey;
    border-color: lighten($dark-grey, 33.3%);
    outline: 0;
  }
}

.button:focus,
button:focus {
  color: $dark-grey;
  border-color: lighten($dark-grey, 33.3%);
  outline: 0;
}

input {
  &[type="submit"]:focus,
  &[type="reset"]:focus,
  &[type="button"]:focus {
    color: $dark-grey;
    border-color: lighten($dark-grey, 33.3%);
    outline: 0;
  }
}

.button.button-primary,
button.button-primary {
  color: #fff;
  background-color: $primary-color;
  border-color: $primary-color;
}

input {
  &[type="submit"].button-primary,
  &[type="reset"].button-primary,
  &[type="button"].button-primary {
    color: #fff;
    background-color: $primary-color;
    border-color: $primary-color;
  }
}

.button.button-primary:hover,
button.button-primary:hover {
  color: #fff;
  background-color: $link-color;
  border-color: $link-color;
}

input {
  &[type="submit"].button-primary:hover,
  &[type="reset"].button-primary:hover,
  &[type="button"].button-primary:hover {
    color: #fff;
    background-color: $link-color;
    border-color: $link-color;
  }
}

.button.button-primary:focus,
button.button-primary:focus {
  color: #fff;
  background-color: $link-color;
  border-color: $link-color;
}

input {
  &[type="submit"].button-primary:focus,
  &[type="reset"].button-primary:focus,
  &[type="button"].button-primary:focus {
    color: #fff;
    background-color: $link-color;
    border-color: $link-color;
  }
  &[type="email"],
  &[type="number"],
  &[type="search"],
  &[type="text"],
  &[type="tel"],
  &[type="url"],
  &[type="password"] {
    height: 38px;
    padding: 6px 10px; // The 6px vertically centers text on FF, ignored by Webkit
    background-color: #fff;
    border: 1px solid lighten($border-color, 8.8%);
    border-radius: $global-radius;
    box-shadow: none;
    box-sizing: border-box;
  }
}

// Forms
//––––––––––––––––––––––––––––––––––––––––––––––––––

textarea,
select {
  height: 38px;
  padding: 6px 10px; // The 6px vertically centers text on FF, ignored by Webkit
  background-color: #fff;
  border: 1px solid lighten($border-color, 8.8%);
  border-radius: $global-radius;
  box-shadow: none;
  box-sizing: border-box;
}

// Removes awkward default styles on some inputs for iOS
input {
  &[type="email"],
  &[type="number"],
  &[type="search"],
  &[type="text"],
  &[type="tel"],
  &[type="url"],
  &[type="password"] {
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
  }
}

textarea {
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
  min-height: 65px;
  padding-top: 6px;
  padding-bottom: 6px;
}

input {
  &[type="email"]:focus,
  &[type="number"]:focus,
  &[type="search"]:focus,
  &[type="text"]:focus,
  &[type="tel"]:focus,
  &[type="url"]:focus,
  &[type="password"]:focus {
    border: 1px solid $primary-color;
    outline: 0;
  }
}

textarea:focus,
select:focus {
  border: 1px solid $primary-color;
  outline: 0;
}

label,
legend {
  display: block;
  margin-bottom: .5rem;
  font-weight: 600;
}

fieldset {
  padding: 0;
  border-width: 0;
}

input {
  &[type="checkbox"],
  &[type="radio"] {
    display: inline;
  }
}

label > .label-body {
  display: inline-block;
  margin-left: .5rem;
  font-weight: normal;
}

// Lists
//––––––––––––––––––––––––––––––––––––––––––––––––––

ul {
  list-style: circle inside;
}

ol {
  list-style: decimal inside;
  padding-left: 0;
  margin-top: 0;
}

ul {
  padding-left: 0;
  margin-top: 0;
  ul, ol {
    margin: 1.5rem 0 1.5rem 3rem;
    font-size: 90%;
  }
}

ol {
  ol, ul {
    margin: 1.5rem 0 1.5rem 3rem;
    font-size: 90%;
  }
}

li {
  margin-bottom: 1rem;
}

// Code
//––––––––––––––––––––––––––––––––––––––––––––––––––

code {
  padding: .2rem .5rem;
  margin: 0 .2rem;
  font-size: 90%;
  white-space: nowrap;
  background: lighten($light-grey, 6.4%);
  border: 1px solid $light-grey;
  border-radius: $global-radius;
}

pre > code {
  display: block;
  padding: 1rem 1.5rem;
  white-space: pre;
}

// Tables
//––––––––––––––––––––––––––––––––––––––––––––––––––

th,
td {
  padding: 12px 15px;
  text-align: left;
  border-bottom: 1px solid $light-grey;
}

th:first-child,
td:first-child {
  padding-left: 0;
}

th:last-child,
td:last-child {
  padding-right: 0;
}

// Spacing
//––––––––––––––––––––––––––––––––––––––––––––––––––

button,
.button {
  margin-bottom: 1rem;
}

input,
textarea,
select,
fieldset {
  margin-bottom: 1.5rem;
}

pre,
blockquote,
dl,
figure,
table,
p,
ul,
ol,
form {
  margin-bottom: 2.5rem;
}

// Utilities
//––––––––––––––––––––––––––––––––––––––––––––––––––

.u-full-width {
  width: 100%;
  box-sizing: border-box;
}

.u-max-full-width {
  max-width: 100%;
  box-sizing: border-box;
}

.u-pull-right {
  float: right;
}

.u-pull-left {
  float: left;
}

// Misc
//––––––––––––––––––––––––––––––––––––––––––––––––––

hr {
  margin-top: 3rem;
  margin-bottom: 3.5rem;
  border-width: 0;
  border-top: 1px solid $light-grey;
}

// Clearing
//––––––––––––––––––––––––––––––––––––––––––––––––––

// Self Clearing Goodness

.container:after,
.row:after,
.u-cf {
  content: "";
  display: table;
  clear: both;
}

// Media Queries
//––––––––––––––––––––––––––––––––––––––––––––––––––

// Note: The best way to structure the use of media queries is to create the queries
// near the relevant code. For example, if you wanted to change the styles for buttons
// on small devices, paste the mobile query code up in the buttons section and style it
// there.

// Larger than mobile
@media (#{$bp-larger-than-mobile}) {}

// Larger than phablet (also point when grid becomes active)
@media (#{$bp-larger-than-phablet}) {}

// Larger than tablet
@media (#{$bp-larger-than-tablet}) {}

// Larger than desktop
@media (#{$bp-larger-than-desktop}) {}

// Larger than Desktop HD
@media (#{$bp-larger-than-desktophd}) {}

SassMeister-output.css

/*
* Skeleton V2.0.4
* Copyright 2014, Dave Gamache
* www.getskeleton.com
* Free to use under the MIT license.
* http://www.opensource.org/licenses/mit-license.php
* 12/9/2014
* Sass Version by Seth Coelen https://github.com/whatsnewsaes
*/
.container {
  position: relative;
  width: 100%;
  max-width: 960px;
  margin: 0 auto;
  padding: 0 20px;
  box-sizing: border-box;
}

.column,
.columns {
  width: 100%;
  float: left;
  box-sizing: border-box;
}

@media (min-width: 400px) {
  .container {
    width: 85%;
    padding: 0;
  }
}
@media (min-width: 550px) {
  .container {
    width: 80%;
  }

  .column,
  .columns {
    margin-left: 4%;
  }

  .column:first-child,
  .columns:first-child {
    margin-left: 0;
  }

  .one.column,
  .one.columns {
    width: 4.66667%;
  }

  .two.columns {
    width: 13.33333%;
  }

  .three.columns {
    width: 22%;
  }

  .four.columns {
    width: 30.66667%;
  }

  .five.columns {
    width: 39.33333%;
  }

  .six.columns {
    width: 48%;
  }

  .seven.columns {
    width: 56.66667%;
  }

  .eight.columns {
    width: 65.33333%;
  }

  .nine.columns {
    width: 74%;
  }

  .ten.columns {
    width: 82.66667%;
  }

  .eleven.columns {
    width: 91.33333%;
  }

  .twelve.columns {
    width: 100%;
    margin-left: 0;
  }

  .one-third.column {
    width: 30.66667%;
  }

  .two-thirds.column {
    width: 65.33333%;
  }

  .one-half.column {
    width: 48%;
  }

  .offset-by-one.column,
  .offset-by-one.columns {
    margin-left: 8.66667%;
  }

  .offset-by-two.column,
  .offset-by-two.columns {
    margin-left: 17.33333%;
  }

  .offset-by-three.column,
  .offset-by-three.columns {
    margin-left: 26%;
  }

  .offset-by-four.column,
  .offset-by-four.columns {
    margin-left: 34.66667%;
  }

  .offset-by-five.column,
  .offset-by-five.columns {
    margin-left: 43.33333%;
  }

  .offset-by-six.column,
  .offset-by-six.columns {
    margin-left: 52%;
  }

  .offset-by-seven.column,
  .offset-by-seven.columns {
    margin-left: 60.66667%;
  }

  .offset-by-eight.column,
  .offset-by-eight.columns {
    margin-left: 69.33333%;
  }

  .offset-by-nine.column,
  .offset-by-nine.columns {
    margin-left: 78%;
  }

  .offset-by-ten.column,
  .offset-by-ten.columns {
    margin-left: 86.66667%;
  }

  .offset-by-eleven.column,
  .offset-by-eleven.columns {
    margin-left: 95.33333%;
  }

  .offset-by-one-third.column,
  .offset-by-one-third.columns {
    margin-left: 34.66667%;
  }

  .offset-by-two-thirds.column,
  .offset-by-two-thirds.columns {
    margin-left: 69.33333%;
  }

  .offset-by-one-half.column,
  .offset-by-one-half.column {
    margin-left: 52%;
  }

  .offset-by-one-B.column,
  .offset-by-one-B.columns {
    margin-left: 12.66667%;
  }
  .offset-by-one-B.column:first-child,
  .offset-by-one-B.columns:first-child {
    margin-left: 8.66667%;
  }

  .offset-by-two-B.column,
  .offset-by-two-B.columns {
    margin-left: 21.33333%;
  }
  .offset-by-two-B.column:first-child,
  .offset-by-two-B.columns:first-child {
    margin-left: 17.33333%;
  }

  .offset-by-three-B.column,
  .offset-by-three-B.columns {
    margin-left: 30%;
  }
  .offset-by-three-B.column:first-child,
  .offset-by-three-B.columns:first-child {
    margin-left: 26%;
  }

  .offset-by-four-B.column,
  .offset-by-four-B.columns {
    margin-left: 38.66667%;
  }
  .offset-by-four-B.column:first-child,
  .offset-by-four-B.columns:first-child {
    margin-left: 34.66667%;
  }

  .offset-by-five-B.column,
  .offset-by-five-B.columns {
    margin-left: 47.33333%;
  }
  .offset-by-five-B.column:first-child,
  .offset-by-five-B.columns:first-child {
    margin-left: 43.33333%;
  }

  .offset-by-six-B.column,
  .offset-by-six-B.columns {
    margin-left: 56%;
  }
  .offset-by-six-B.column:first-child,
  .offset-by-six-B.columns:first-child {
    margin-left: 52%;
  }

  .offset-by-seven-B.column,
  .offset-by-seven-B.columns {
    margin-left: 64.66667%;
  }
  .offset-by-seven-B.column:first-child,
  .offset-by-seven-B.columns:first-child {
    margin-left: 60.66667%;
  }

  .offset-by-eight-B.column,
  .offset-by-eight-B.columns {
    margin-left: 73.33333%;
  }
  .offset-by-eight-B.column:first-child,
  .offset-by-eight-B.columns:first-child {
    margin-left: 69.33333%;
  }

  .offset-by-nine-B.column,
  .offset-by-nine-B.columns {
    margin-left: 82%;
  }
  .offset-by-nine-B.column:first-child,
  .offset-by-nine-B.columns:first-child {
    margin-left: 78%;
  }

  .offset-by-ten-B.column,
  .offset-by-ten-B.columns {
    margin-left: 90.66667%;
  }
  .offset-by-ten-B.column:first-child,
  .offset-by-ten-B.columns:first-child {
    margin-left: 86.66667%;
  }

  .offset-by-eleven-B.column,
  .offset-by-eleven-B.columns {
    margin-left: 99.33333%;
  }
  .offset-by-eleven-B.column:first-child,
  .offset-by-eleven-B.columns:first-child {
    margin-left: 95.33333%;
  }

  .offset-by-one-third-B.column,
  .offset-by-one-third-B.columns {
    margin-left: 38.66667%;
  }
  .offset-by-one-third-B.column:first-child,
  .offset-by-one-third-B.columns:first-child {
    margin-left: 34.66667%;
  }

  .offset-by-two-thirds-B.column,
  .offset-by-two-thirds-B.columns {
    margin-left: 73.33333%;
  }
  .offset-by-two-thirds-B.column:first-child,
  .offset-by-two-thirds-B.columns:first-child {
    margin-left: 69.33333%;
  }

  .offset-by-one-half-B.column,
  .offset-by-one-half-B.column {
    margin-left: 56%;
  }
  .offset-by-one-half-B.column:first-child,
  .offset-by-one-half-B.column:first-child {
    margin-left: 52%;
  }
}
html {
  font-size: 62.5%;
}

body {
  font-size: 1.5em;
  line-height: 1.6;
  font-weight: 400;
  font-family: "Raleway", "HelveticaNeue", "Helvetica Neue", Helvetica, Arial, sans-serif;
  color: #222;
}

h1, h2, h3, h4, h5, h6 {
  margin-top: 0;
  margin-bottom: 2rem;
  font-weight: 300;
}

h1 {
  font-size: 4.0rem;
  line-height: 1.2;
  letter-spacing: -.1rem;
}

h2 {
  font-size: 3.6rem;
  line-height: 1.25;
  letter-spacing: -.1rem;
}

h3 {
  font-size: 3.0rem;
  line-height: 1.3;
  letter-spacing: -.1rem;
}

h4 {
  font-size: 2.4rem;
  line-height: 1.35;
  letter-spacing: -.08rem;
}

h5 {
  font-size: 1.8rem;
  line-height: 1.5;
  letter-spacing: -.05rem;
}

h6 {
  font-size: 1.5rem;
  line-height: 1.6;
  letter-spacing: 0;
}

@media (min-width: 550px) {
  h1 {
    font-size: 5.0rem;
  }

  h2 {
    font-size: 4.2rem;
  }

  h3 {
    font-size: 3.6rem;
  }

  h4 {
    font-size: 3.0rem;
  }

  h5 {
    font-size: 2.4rem;
  }

  h6 {
    font-size: 1.5rem;
  }
}
p {
  margin-top: 0;
}

a {
  color: #1eaedb;
}
a:hover {
  color: #1b9cc5;
}

.button,
button {
  display: inline-block;
  height: 38px;
  padding: 0 30px;
  color: #555555;
  text-align: center;
  font-size: 11px;
  font-weight: 600;
  line-height: 38px;
  letter-spacing: .1rem;
  text-transform: uppercase;
  text-decoration: none;
  white-space: nowrap;
  background-color: transparent;
  border-radius: 4px;
  border: 1px solid #bbb;
  cursor: pointer;
  box-sizing: border-box;
}

input[type="submit"], input[type="reset"], input[type="button"] {
  display: inline-block;
  height: 38px;
  padding: 0 30px;
  color: #555555;
  text-align: center;
  font-size: 11px;
  font-weight: 600;
  line-height: 38px;
  letter-spacing: .1rem;
  text-transform: uppercase;
  text-decoration: none;
  white-space: nowrap;
  background-color: transparent;
  border-radius: 4px;
  border: 1px solid #bbb;
  cursor: pointer;
  box-sizing: border-box;
}

.button:hover,
button:hover {
  color: #333;
  border-color: #888888;
  outline: 0;
}

input[type="submit"]:hover, input[type="reset"]:hover, input[type="button"]:hover {
  color: #333;
  border-color: #888888;
  outline: 0;
}

.button:focus,
button:focus {
  color: #333;
  border-color: #888888;
  outline: 0;
}

input[type="submit"]:focus, input[type="reset"]:focus, input[type="button"]:focus {
  color: #333;
  border-color: #888888;
  outline: 0;
}

.button.button-primary,
button.button-primary {
  color: #fff;
  background-color: #33c3f0;
  border-color: #33c3f0;
}

input[type="submit"].button-primary, input[type="reset"].button-primary, input[type="button"].button-primary {
  color: #fff;
  background-color: #33c3f0;
  border-color: #33c3f0;
}

.button.button-primary:hover,
button.button-primary:hover {
  color: #fff;
  background-color: #1eaedb;
  border-color: #1eaedb;
}

input[type="submit"].button-primary:hover, input[type="reset"].button-primary:hover, input[type="button"].button-primary:hover {
  color: #fff;
  background-color: #1eaedb;
  border-color: #1eaedb;
}

.button.button-primary:focus,
button.button-primary:focus {
  color: #fff;
  background-color: #1eaedb;
  border-color: #1eaedb;
}

input[type="submit"].button-primary:focus, input[type="reset"].button-primary:focus, input[type="button"].button-primary:focus {
  color: #fff;
  background-color: #1eaedb;
  border-color: #1eaedb;
}
input[type="email"], input[type="number"], input[type="search"], input[type="text"], input[type="tel"], input[type="url"], input[type="password"] {
  height: 38px;
  padding: 6px 10px;
  background-color: #fff;
  border: 1px solid #d1d1d1;
  border-radius: 4px;
  box-shadow: none;
  box-sizing: border-box;
}

textarea,
select {
  height: 38px;
  padding: 6px 10px;
  background-color: #fff;
  border: 1px solid #d1d1d1;
  border-radius: 4px;
  box-shadow: none;
  box-sizing: border-box;
}

input[type="email"], input[type="number"], input[type="search"], input[type="text"], input[type="tel"], input[type="url"], input[type="password"] {
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
}

textarea {
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
  min-height: 65px;
  padding-top: 6px;
  padding-bottom: 6px;
}

input[type="email"]:focus, input[type="number"]:focus, input[type="search"]:focus, input[type="text"]:focus, input[type="tel"]:focus, input[type="url"]:focus, input[type="password"]:focus {
  border: 1px solid #33c3f0;
  outline: 0;
}

textarea:focus,
select:focus {
  border: 1px solid #33c3f0;
  outline: 0;
}

label,
legend {
  display: block;
  margin-bottom: .5rem;
  font-weight: 600;
}

fieldset {
  padding: 0;
  border-width: 0;
}

input[type="checkbox"], input[type="radio"] {
  display: inline;
}

label > .label-body {
  display: inline-block;
  margin-left: .5rem;
  font-weight: normal;
}

ul {
  list-style: circle inside;
}

ol {
  list-style: decimal inside;
  padding-left: 0;
  margin-top: 0;
}

ul {
  padding-left: 0;
  margin-top: 0;
}
ul ul, ul ol {
  margin: 1.5rem 0 1.5rem 3rem;
  font-size: 90%;
}

ol ol, ol ul {
  margin: 1.5rem 0 1.5rem 3rem;
  font-size: 90%;
}

li {
  margin-bottom: 1rem;
}

code {
  padding: .2rem .5rem;
  margin: 0 .2rem;
  font-size: 90%;
  white-space: nowrap;
  background: #f1f1f1;
  border: 1px solid #e1e1e1;
  border-radius: 4px;
}

pre > code {
  display: block;
  padding: 1rem 1.5rem;
  white-space: pre;
}

th,
td {
  padding: 12px 15px;
  text-align: left;
  border-bottom: 1px solid #e1e1e1;
}

th:first-child,
td:first-child {
  padding-left: 0;
}

th:last-child,
td:last-child {
  padding-right: 0;
}

button,
.button {
  margin-bottom: 1rem;
}

input,
textarea,
select,
fieldset {
  margin-bottom: 1.5rem;
}

pre,
blockquote,
dl,
figure,
table,
p,
ul,
ol,
form {
  margin-bottom: 2.5rem;
}

.u-full-width {
  width: 100%;
  box-sizing: border-box;
}

.u-max-full-width {
  max-width: 100%;
  box-sizing: border-box;
}

.u-pull-right {
  float: right;
}

.u-pull-left {
  float: left;
}

hr {
  margin-top: 3rem;
  margin-bottom: 3.5rem;
  border-width: 0;
  border-top: 1px solid #e1e1e1;
}

.container:after,
.row:after,
.u-cf {
  content: "";
  display: table;
  clear: both;
}

SassMeister-rendered.html

<style>
  .column,.columns{
    background: #DDD;
    text-align: center;
    border-radius: 4px;
    font-size: 1rem;
    text-transform: uppercase;
    height: 30px;
    line-height: 30px;
    margin-bottom: .75rem;
    font-weight: 600;
    letter-spacing: .1rem;
  }
</style>

<div class="container">

  <h2>Current Offset Method</h2>
  <p>This result matches the behavior of skeleton CSS exactly (for a column-margin of 4%). The offsets don't seem to line up with the grid nicely or fill the entire width - perhaps this is the intended behavior, but it's not what I expected</p>
  <div class="row">
    <div class="one column">one</div>
    <div class="one column">one</div>
    <div class="one column">one</div>
    <div class="one column">one</div>
    <div class="one column">one</div>
    <div class="one column">one</div>
    <div class="one column">one</div>
    <div class="one column">one</div>
    <div class="one column">one</div>
    <div class="one column">one</div>
    <div class="one column">one</div>
    <div class="one column">one</div>
  </div>
  <div class="row">
    <div class="two columns">two</div>
    <div class="two columns">two</div>
    <div class="two columns">two</div>
    <div class="two columns">two</div>
    <div class="two columns">two</div>
    <div class="two columns">two</div>
  </div>
  <strong>Offset examples</strong>
  <div class="row">
    <div class="one column">one</div>
    <div class="offset-by-one one column">one</div>
    <div class="one column">one</div>
    <div class="offset-by-one one column">one</div>
    <div class="one column">one</div>
    <div class="offset-by-one three columns">three</div>
    <div class="one column">one</div>
  </div>
  <div class="row">
    <div class="one column">one</div>
    <div class="offset-by-five one-half column">one-half</div>
  </div>
  <div class="row">
    <div class="offset-by-one two columns">two</div>
    <div class="offset-by-one two columns">two</div>
    <div class="offset-by-one two columns">two</div>
    <div class="offset-by-one two columns">two</div>
  </div>

  <hr>
  <h2>Altered Method</h2>
  <p>A minor modification to the calculation of offsets - the columns now all line up and behave as I would expect (for any column-margin)</p>
  <div class="row">
    <div class="one column">one</div>
    <div class="one column">one</div>
    <div class="one column">one</div>
    <div class="one column">one</div>
    <div class="one column">one</div>
    <div class="one column">one</div>
    <div class="one column">one</div>
    <div class="one column">one</div>
    <div class="one column">one</div>
    <div class="one column">one</div>
    <div class="one column">one</div>
    <div class="one column">one</div>
  </div>
  <div class="row">
    <div class="two columns">two</div>
    <div class="two columns">two</div>
    <div class="two columns">two</div>
    <div class="two columns">two</div>
    <div class="two columns">two</div>
    <div class="two columns">two</div>
  </div>
  <strong>Offset examples</strong>
  <div class="row">
    <div class="one column">one</div>
    <div class="offset-by-one-B one column">one</div>
    <div class="one column">one</div>
    <div class="offset-by-one-B one column">one</div>
    <div class="one column">one</div>
    <div class="offset-by-one-B three columns">three</div>
    <div class="one column">one</div>
  </div>
  <div class="row">
    <div class="one column">one</div>
    <div class="offset-by-five-B one-half column">one-half</div>
  </div>
  <div class="row">
    <div class="offset-by-one-B two columns">two</div>
    <div class="offset-by-one-B two columns">two</div>
    <div class="offset-by-one-B two columns">two</div>
    <div class="offset-by-one-B two columns">two</div>
  </div>
  
</div>