CodePen

HTML

            
              <h1>Don't Overthink It Grids <em>(while we wait for flexbox!)</em></h1>

<div class="grid">
   <div class="col-1-3">
     <div class="module">
     		<h3>1/3</h3>
				<p>Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae, ultricies</p>	
     </div>
   </div>
   <div class="col-1-3">
     <div class="module">
     		<h3>1/3</h3>
				<p>Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae, ultricies</p>	
     </div>
   </div>
   <div class="col-1-3">
     <div class="module">
     		<h3>1/3</h3>
				<p>Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae, ultricies</p>	
     </div>
   </div>
</div>
            
          
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CSS

            
              * {
  @include box-sizing(border-box);
}

$pad: 20px;

.grid {
  background: white;
  margin: 0 0 $pad 0;
  
  &:after {
    /* Or @extend clearfix */
    content: "";
    display: table;
    clear: both;
  }
}

[class*='col-'] {
	float: left;
  padding-right: $pad;
  .grid &:last-of-type {
  	padding-right: 0;
  }
}
.col-2-3 {
	width: 66.66%;
}
.col-1-3 {
	width: 33.33%;
}
.col-1-2 {
	width: 50%;
}
.col-1-4 {
	width: 25%;
}
.col-1-8 {
	width: 12.5%;
}

.module {
  padding: $pad;
  background: #eee;
}

/* Opt-in outside padding */
.grid-pad {
  padding: $pad 0 $pad $pad;
  [class*='col-']:last-of-type {
    padding-right: $pad;
  }
}

body {
	padding: 10px 50px 200px;
  background: url(http://s.cdpn.io/3/dark_wall_@2X.png);
  background-size: 300px 300px;
}
h1 {
  color: white;
  em {
  	color: #666;
    font-size: 16px;
  }
}
            
          
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