JSFiddle - React, Tailwind, and code Playground

by Vladimir Kutepov

HTML

<div id="envelope"></div>

CSS

div#envelope{
width: 800px;
height: 400px;
margin: 140px 23% 10px 16%;
padding:33px 0 10px 0;
border: 2px solid black;
border-radius:2px;
background:
        linear-gradient(to left top, rgba(0, 255, 255, 1) 0%, rgba(255, 255, 0, 1) 100% /*top-left color*/);