JSFiddle - React, Tailwind, and code Playground

HTML

<div class="outter">
  <div class="inner">
    
  </div>
</div>

CSS

html,body {
  padding:0;
  margin:0;
}
body {
  background:#777;
}
.outter {
  background:#099;
  text-align:center;
}
.inner {
  background:#ff0;
  width:400px;
  height:150px;
  margin:0 auto;
  margin-top:50px;
}