JSFiddle - React, Tailwind, and code Playground

HTML

<div style="background-color:red;" class="div"></div>


<span style="width:200px" class="span"></span>

CSS

.div {
    background-color:#000;
    width:10px;
    height:10px;
}

span {
    width:20px;
    height:5px;
    display:block;
    border:1px solid red;
}
}