JSFiddle - React, Tailwind, and code Playground

HTML

<div>gauche</div>
<div>droite</div>

CSS

div {
    float: left;
    color: #FFF;
}
div:first-child {
    width: 60%;
    background: #000;
}
div:nth-child(2) {
    width: 35%;
    margin-left: 5%;
    background: #F03;
}