JSFiddle - React, Tailwind, and code Playground
CSS
html {
height: 100%;
-webkit-background-size: cover;
-moz-background-size: cover;
-o-background-size: cover;
background-size: cover;
background: #70bg32;
background-repeat:no-repeat;
background: -webkit-linear-gradient( to left top, blue, red);
background: -moz-linear-gradient( to left top, blue, red);
background: -ms-linear-gradient( to left top, blue, red);
background: -o-linear-gradient( to left top, blue, red);
background: linear-gradient( to left top, blue, red);
}