CodePen Embed - Viewport units

<div class="left">left</div>
<div class="right">right</div>

* {
  padding: 0;
  margin: 0
}

.left {
  float: left;
  width: 60vw;
  height: 50vh;
  background-color: #f44336;
  text-align: center;
  line-height: 50vh;
  font-size: 3rem
}

.right {
  float: right;
  width: 40vw;
  height: 30vh;
  background-color: #2196f3;
  text-align: center;
  line-height: 30vh;
  font-size: 2rem
}

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