JSFiddle - React, Tailwind, and code Playground

HTML

<div id="a">A</div>
<div id="b">B</div>
<div id="c">C</div>
<div id="d">D</div>

CSS

div {
    width:50vw;
    height:50vw;
    display:inline;
    float:left;
}
#a {
    background-color:red;
}
#b {
    background-color:blue;
}
#c {
    background-color:green;
}
#d {
    background-color:yellow;
}