Custom Bootstrap 3 Grid for 480-767px Layout

bootstrap-480-767-grid.css

/**
  * Custom Bootstrap 3 grid for 480-767px layout
  * Author: Iftakhar Hasan
  *
  * A new set of column classes (with class prefix .col-ms- ) for Bootstrap 3
  * to make Medium Small grids for supporting 480-767px
  *
  * This will push the default Bootstrap 3 Extra Small column (class prefix .col-xs- )
  * to support 1-479px instead of 1-767px
  */

.col-ms-1,
.col-ms-2,
.col-ms-3,
.col-ms-4,
.col-ms-5,
.col-ms-6,
.col-ms-7,
.col-ms-8,
.col-ms-9,
.col-ms-10,
.col-ms-11,
.col-ms-12 {position:relative; padding-left:15px; padding-right:15px;} 
@media (min-width: 480px) and (max-width: 767px) {
  .container {max-width:748px;} 
  .col-ms-1,
  .col-ms-2,
  .col-ms-3,
  .col-ms-4,
  .col-ms-5,
  .col-ms-6,
  .col-ms-7,
  .col-ms-8,
  .col-ms-9,
  .col-ms-10,
  .col-ms-11 {float:left;}
  .col-ms-1 {width:8.33333333%;}
  .col-ms-2 {width:16.66666667%;}
  .col-ms-3 {width:25%;}
  .col-ms-4 {width:33.33333333%;}
  .col-ms-5 {width:41.66666667%;}
  .col-ms-6 {width:50%;}
  .col-ms-7 {width:58.33333333%;}
  .col-ms-8 {width:66.66666667%;}
  .col-ms-9 {width:75%;}
  .col-ms-10 {width:83.33333333%;}
  .col-ms-11 {width:91.66666667%;}
  .col-ms-12 {width:100%;}
  .col-ms-pull-0 {right:auto;}
  .col-ms-pull-1 {right:8.33333333%;}
  .col-ms-pull-2 {right:16.66666667%;}
  .col-sm-pull-3 {right:25%;}
  .col-sm-pull-4 {right:33.33333333%;}
  .col-sm-pull-5 {right:41.66666667%;}
  .col-sm-pull-6 {right:50%;}
  .col-sm-pull-7 {right:58.33333333%;}
  .col-ms-pull-8 {right:66.66666667%;}
  .col-ms-pull-9 {right:75%;}
  .col-ms-pull-10 {right:83.33333333%;}
  .col-ms-pull-11 {right:91.66666667%;}
  .col-ms-pull-12 {right:100%;}
  .col-ms-push-0 {left:auto;}
  .col-ms-push-1 {left:8.33333333%;}
  .col-ms-push-2 {left:16.66666667%;}
  .col-sm-push-3 {left:25%;}
  .col-sm-push-4 {left:33.33333333%;}
  .col-sm-push-5 {left:41.66666667%;}
  .col-sm-push-6 {left:50%;}
  .col-sm-push-7 {left:58.33333333%;}
  .col-ms-push-8 {left:66.66666667%;}
  .col-ms-push-9 {left:75%;}
  .col-ms-push-10 {left:83.33333333%;}
  .col-ms-push-11 {left:91.66666667%;}
  .col-ms-push-12 {left:100%;}
  .col-ms-offset-0 {margin-left:0;}
  .col-ms-offset-1 {margin-left:8.33333333%;}
  .col-ms-offset-2 {margin-left:16.66666667%;}
  .col-ms-offset-3 {margin-left:25%;}
  .col-ms-offset-4 {margin-left:33.33333333%;}
  .col-ms-offset-5 {margin-left:41.66666667%;}
  .col-ms-offset-6 {margin-left:50%;}
  .col-ms-offset-7 {margin-left:58.33333333%;}
  .col-ms-offset-8 {margin-left:66.66666667%;}
  .col-ms-offset-9 {margin-left:75%;}
  .col-ms-offset-10 {margin-left:83.33333333%;}
  .col-ms-offset-11 {margin-left:91.66666667%;}
  .col-ms-offset-12 {margin-left:100%;}
}

This is great. Adding support for hidden-ms would make it even better!

.hidden-ms { display: none !important; }

Add this between line 87 and 88.

Please be aware when using this code, you must also include a matching col-sm-* class, otherwise, when the screen gets bigger than 768, the elements will collapse to the same format as the col-xs-*.

For Example:
<div class="col-xs-12 col-ms-6 col-sm-6"> will be the entire width on phone(portrait), and half-width on phone(landscape) and larger.

<div class="col-xs-12 col-ms-6"> will be the entire width on phone(portrait), and half-width on phone(landscape). It will go back to being entire width (occupy 12 spaces in the grid) when the screen size changes to tablet or larger.

Bootstrap-v4 is changing the screen breakpoints to address the problem being solved by this gist.
https://v4-alpha.getbootstrap.com/layout/grid/#grid-options
http://getbootstrap.com/css/#grid-options