JSFiddle - React, Tailwind, and code Playground

HTML

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

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

<div class="main">
  this is main content
</div>

CSS

.left{
  float:left;
  width:200px;
  height:150px;
  background: red;
}

.right{
  float: right;
  width: 200px;
  height: 180px;
  background: blue;
}

.main{
  //overflow: hidden;
  background: green;
}