JSFiddle - React, Tailwind, and code Playground

HTML

<div id="container"></div>

CSS

html{
    min-height: 100%;
    height:100%;
}
body{
    margin:0px; 
    padding:0px;
    height:100%;
}
#container{
    background-color:rgba(0, 0, 0, 0.7);
    height:inherit;
    border:1px solid #333;
}