JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
        <div class="left">
            LEFT
        </div>
        <div class="right">
            RIGHT
        </div>
</div>

CSS

div.left {
    background:blue;
    height:200px;
    width:300px;
}

div.right{
    background:green;
    height:300px;
    width:100px;
}

.container{
    background:black;
    height:400px;
    width:450px;
}

.container div {
    display: inline-block;
}