JSFiddle - React, Tailwind, and code Playground

HTML

<div style="background-color:red;"></div><div style="background-color:blue;"></div><div style="background-color:green;"></div><div style="background-color:yellow;"></div>

CSS

body {
    padding: 0px;
    margin: 0px;
    width: 100%;
}

div {
    display: inline-block;
    margin: 0px;
    padding: 0px;
    width: 50px;
    height: 50px;
}