JSFiddle - React, Tailwind, and code Playground

HTML

<div></div>

CSS

div {
    height: 100px;
    width: 100px;
    background-color: #FA6900;
    border-radius: 5px;
}

div:after {
    content: " X";
    font-size: 2em; 
    color: #FFF;
}