<div class="container">
  <div class="left">
    左
  </div>
  <div class="right">
    右
  </div>
</div>
.container{
  width:800px;
  height:200px;
  font-size:0;
}
.left{
  font-size:14px;
  background:red;
  display: inline-block;
  width:200px;
  height:200px;
}
.right{
  font-size:14px;
  background:blue;
  display: inline-block;
  width:600px;
  height:200px;
}

External CSS

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External JavaScript

This Pen doesn't use any external JavaScript resources.