JSFiddle - React, Tailwind, and code Playground

HTML

<div class="example"></div>

CSS

.example {
    background: black;
    height: 250px;
    width: 500px;
}
.example:after {
    display: flex;
    align-items: center;
    content: "+";
    color: white;
    font-size: 100px;
}