JSFiddle - React, Tailwind, and code Playground

HTML

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

CSS

.container {
  width: 300px;
  margin: 0 auto;
}
.left {
  float: left;
  width: 200px;
  height: 300px;
  background: blue;
}
.right {
  float: right;
  width: 100px;
  height: 300px;
  background: red;
}