JSFiddle - React, Tailwind, and code Playground

HTML

<div class="wrap">
         <div class="block"></div>
     </div>

CSS

html{
height:100%;
}

body{
margin:0;
padding:0;
height:100%;
}

.wrap{
margin:0 auto;
background:red;
width:500px;
height:100%;
}

.block{
height:100%;
background:grey;
}