JSFiddle - React, Tailwind, and code Playground

HTML

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

CSS

.container {
  width:70%;
}

.left {
    height:20px;
  width:70%;
  float:left;
  margin-left:-30%;
  background-color:#00a;
  color:#ddd;
}

.right {
  width:30%;
  background-color:#0a0;
  float:left;
  margin-top:20px;
    
  
    
}