CodePen

HTML

            
              <div class="grid">
  
  <div class="size1of2">
    <section>
      <header>Size 1 of 2</header>
      Lorem ipsum dolor sit amet, jumentum consectetuer ex minim quis luctus rusticus mauris volutpat, pala bene nibh. Praesent ea, facilisi pagus mauris iriure immitto hendrerit damnum meus damnum nulla iustum.
    </section>
  </div>
  
  <div class="size1of2">
    <section>
      <header>Size 1 of 2</header>
      Lorem ipsum dolor sit amet, jumentum consectetuer ex minim quis luctus rusticus mauris volutpat, pala bene nibh. Praesent ea, facilisi pagus mauris iriure immitto hendrerit damnum meus damnum nulla iustum.
    </section>
  </div>
  
  <div class="size2of3">
    <section>
      <header>Size 2 of 3</header>
      Lorem ipsum dolor praesent ea, facilisi pagus mauris iriure immitto hendrerit damnum meus damnum nulla iustum.
    </section>
  </div>
  
  <div class="size1of3">
    <section>
      <header>Size 1 of 3</header>
      Lorem ipsum dolor praesent ea, facilisi pagus mauris iriure immitto hendrerit damnum meus damnum nulla iustum.
    </section>
  </div>
  
  <div class="size1of4">
    <section>
      <header>Size 1 of 4</header>
      Lorem ipsum dolor praesent ea, facilisi pagus mauris iriure immitto hendrerit damnum meus damnum nulla iustum.
    </section>
  </div>
  
  <div class="size1of2">
    <section>
      <header>Size 1 of 2</header>
      Lorem ipsum dolor praesent ea, facilisi pagus mauris iriure immitto hendrerit damnum meus damnum nulla iustum.
    </section>
  </div>
  
  <div class="size1of8">
    <section>
      <header>Size 1 of 8</header>
      Happy
    </section>
  </div>
  
  <div class="size1of8">
    <section>
      <header>Size 1 of 8</header>
      Thoughts!
    </section>
  </div>
  
</div>
            
          
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via HTML Inspector

CSS

            
              /*
-----------Non-Semantic Helper Classes-----------
*/
.borderBox, 
  .grid,
  .grid:after,
  .grid:before,
  .grid [class*='size'],
  .grid [class*='size']:after,
  .grid [class*='size']:before,
  section
{
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
}

/*
-----------Grid Formatting-----------
*/
.grid:after { content: ""; display: table; clear: both; }
.grid .size1of1 { float: none; }
.grid .size1of2 { width: 50%; }
.grid .size1of3 { width: 33.33333%; }
.grid .size2of3 { width: 66.66666%; }
.grid .size1of4 { width: 25%; }
.grid .size3of4 { width: 75%; }
.grid .size1of5 { width: 20%; }
.grid .size2of5 { width: 40%; }
.grid .size3of5 { width: 60%; }
.grid .size4of5 { width: 80%; }
.grid .size1of6 { width: 16.6666666%; }
.grid .size5of6 { width: 83.3333333%; }
.grid .size1of7 { width: 14.2857143%; }
.grid .size2of7 { width: 28.5714286%; }
.grid .size3of7 { width: 42.8571429%; }
.grid .size4of7 { width: 57.1428572%; }
.grid .size5of7 { width: 71.4285715%; }
.grid .size6of7 { width: 85.7142858%; }
.grid .size1of8 { width: 12.5%; }
.grid .size3of8 { width: 37.5%; }
.grid .size5of8 { width: 62.5%; }
.grid .size7of8 { width: 87.5%; }
.grid [class*='size'] { float: left; }

/*
-----------Gutter Formatting-----------
*/
.grid { margin-left: -30px; }
.grid [class*='size'] { padding: 0 0 30px 30px; }

/*
-----------Design Styles-----------
*/
body { margin: 25px 20px; font: 13px/18px Arial, Helvetica, sans-serif; }
section, section > header { border: 1px solid #cdcdcd; }
section {
  display: inline-block;
  width: 100%;
  -webkit-border-radius: 3px; -moz-border-radius: 3px; border-radius: 3px;
  background: #f5f5f5;
	-webkit-box-shadow: 0 2px 2px -2px #ccc;
  -moz-box-shadow: 0 2px 2px -2px #ccc;
  box-shadow: 0 2px 2px -2px #ccc;
  padding: 15px;
}
section > header {
  margin: -15px -15px 15px -15px;
	border-width: 0 0 1px;
  -webkit-border-radius: 2px 2px 0 0;
  -moz-border-radius: 2px 2px 0 0;
  border-radius: 2px 2px 0 0;
	-webkit-box-shadow: 0 1px 0 #fff;
  -moz-box-shadow: 0 1px 0 #fff;
  box-shadow: 0 1px 0 #fff;
  padding: 10px 14px 9px;
	background: #e9e9e9;
	background: -moz-linear-gradient(top,
    rgba(245, 245, 245, .7) 0%,
    rgba(227, 227, 227, .7) 100%
    );
	background: -webkit-gradient(linear, left top, left bottom,
    color-stop(0%, rgba(245, 245, 245, .7)),
    color-stop(100%, rgba(227, 227, 227, .7))
    );
	background: -webkit-linear-gradient(top,
    rgba(245, 245, 245, .7) 0%,
    rgba(227, 227, 227, .7) 100%
    );
	background: -o-linear-gradient(top,
    rgba(245, 245, 245, .7) 0%,
    rgba(227, 227, 227, .7) 100%
    );
	background: -ms-linear-gradient(top,
    rgba(245, 245, 245, .7) 0%,
    rgba(227, 227, 227, .7) 100%
    );
	background: linear-gradient(top,
    rgba(245, 245, 245, .7) 0%,
    rgba(227, 227, 227, .7) 100%
    );
	font-weight: bold;
	-webkit-text-shadow: 0 1px #fff; text-shadow: 0 1px #fff;
}
            
          
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