Generated by SassMeister.com.

SassMeister-input-HTML.html

<div class="container">
  <h1>The 10 column complex nested grid AG test</h1>
  
  <div class="ag ag1">
   <h2>AG 1</h2>
  </div>
  <!-- /ag1 -->
  
  <!-- ag4 to ag7 are nested within ag2.-->
  <div class="ag ag2">
    <h2>AG 2</h2>
    <div class="ag ag4">
      <h2>AG 4</h2>
    </div>
    <div class="ag ag5">
      <h2>AG 5</h2>
    </div>
    <div class="ag ag6">
      <h2>AG 6</h2>
    </div>
  
    <!-- ag8, ag9 and ag10 are nested within ag7 -->
    <div class="ag ag7">
      <h2>AG 7</h2>
      <div class="ag ag8">
        <h2>AG 8</h2>
      </div>
      <div class="ag ag9">
        <h2>AG 9</h2>
      </div>
      <div class="ag ag10">
        <h2>AG 10</h2>
      </div>
    </div>
    <!-- /ag7 -->
  </div>
  <!-- /ag2 -->
  
  <div class="ag ag3">
    <h2>AG 3</h2>
  </div>
  <!-- /ag3 -->

</div>
<!-- /container -->

SassMeister-input.scss

// ----
// Sass (v3.4.21)
// Compass (v1.0.3)
// Susy (v2.2.7)
// ----

@import "susy";
@import "compass";

/**
 * Styles for AG grids & Container
 */

.container {
  @include container;
  @include clearfix; 
  background-color: #fbeecb;
}

.ag1, .ag3 {
  background-color: #71dad2;
}

.ag4,.ag5,.ag8,.ag9 {
  background-color: #ee9e9c;
}

.ag6 {
  background-color: #f09671;
}

.ag7 {
  background-color: #f6d784;
}

.ag10 {
  background-color: #ea9fc3;
}
.ag1 {
  @include span(2 of 10);
}
.ag2 {
  @include span(6 of 10);
  background-color: #fae7b3;
  @include clearfix; 
}
.ag3 {
  @include span(2 of 10 last);
}
.ag4 {
  @include span(3 of 6);
}
.ag5 {
  @include span(3 of 6 last);
}
.ag6 {
  @include span(2 of 6);
}

.ag7 {
  @include span(4 of 6 last);
  @include clearfix;
}
.ag8 {
  @include span(2 of 4);
}

.ag9 {
  @include span(2 of 4 last);
}
.ag10 {
  @include span(full);
}
/**
 * Text Styles
 */
h2 {
  text-align: center;
  font-size: 1rem;
  font-weight: normal;
  padding-top: 1.8rem;
  padding-bottom: 1.8rem;
}

SassMeister-output.css

/**
 * Styles for AG grids & Container
 */
.container {
  max-width: 100%;
  margin-left: auto;
  margin-right: auto;
  overflow: hidden;
  *zoom: 1;
  background-color: #fbeecb;
}
.container:after {
  content: " ";
  display: block;
  clear: both;
}

.ag1, .ag3 {
  background-color: #71dad2;
}

.ag4, .ag5, .ag8, .ag9 {
  background-color: #ee9e9c;
}

.ag6 {
  background-color: #f09671;
}

.ag7 {
  background-color: #f6d784;
}

.ag10 {
  background-color: #ea9fc3;
}

.ag1 {
  width: 18.36735%;
  float: left;
  margin-right: 2.04082%;
}

.ag2 {
  width: 59.18367%;
  float: left;
  margin-right: 2.04082%;
  background-color: #fae7b3;
  overflow: hidden;
  *zoom: 1;
}

.ag3 {
  width: 18.36735%;
  float: right;
  margin-right: 0;
}

.ag4 {
  width: 48.27586%;
  float: left;
  margin-right: 3.44828%;
}

.ag5 {
  width: 48.27586%;
  float: right;
  margin-right: 0;
}

.ag6 {
  width: 31.03448%;
  float: left;
  margin-right: 3.44828%;
}

.ag7 {
  width: 65.51724%;
  float: right;
  margin-right: 0;
  overflow: hidden;
  *zoom: 1;
}

.ag8 {
  width: 47.36842%;
  float: left;
  margin-right: 5.26316%;
}

.ag9 {
  width: 47.36842%;
  float: right;
  margin-right: 0;
}

.ag10 {
  width: 100%;
  float: left;
  margin-left: 0;
  margin-right: 0;
}

/**
 * Text Styles
 */
h2 {
  text-align: center;
  font-size: 1rem;
  font-weight: normal;
  padding-top: 1.8rem;
  padding-bottom: 1.8rem;
}

SassMeister-rendered.html

<div class="container">
  <h1>The 10 column complex nested grid AG test</h1>
  
  <div class="ag ag1">
   <h2>AG 1</h2>
  </div>
  <!-- /ag1 -->
  
  <!-- ag4 to ag7 are nested within ag2.-->
  <div class="ag ag2">
    <h2>AG 2</h2>
    <div class="ag ag4">
      <h2>AG 4</h2>
    </div>
    <div class="ag ag5">
      <h2>AG 5</h2>
    </div>
    <div class="ag ag6">
      <h2>AG 6</h2>
    </div>
  
    <!-- ag8, ag9 and ag10 are nested within ag7 -->
    <div class="ag ag7">
      <h2>AG 7</h2>
      <div class="ag ag8">
        <h2>AG 8</h2>
      </div>
      <div class="ag ag9">
        <h2>AG 9</h2>
      </div>
      <div class="ag ag10">
        <h2>AG 10</h2>
      </div>
    </div>
    <!-- /ag7 -->
  </div>
  <!-- /ag2 -->
  
  <div class="ag ag3">
    <h2>AG 3</h2>
  </div>
  <!-- /ag3 -->

</div>
<!-- /container -->