JSFiddle - React, Tailwind, and code Playground

HTML

<div class="one"></div>
<div class="two"></div>
<div class="three"></div>

CSS

body, html {
    margin: 0;
    padding: 0;
}

div {
    width: 100vw;
    height: 100vh;
}

.one {
    background-color: blue;
}

.two {
    background-color: green;
}

.three {
    background-color: yellow;
}