JSFiddle - React, Tailwind, and code Playground

HTML

<body>
    <div class="wrapper">
        <div class="left">
            d
        </div>
        <div class="right">
            d
        </div>
    </div>
</body>

CSS

.body {
    height: 100%;
    width: 100%;
}

.left {
    background-color: red;
    width: 70%;
    height: 100%;
    display: inline-block;
}

.right {
    background-color: yellow;
    display:inline-block;
    width: 30%;
    height: 100%;
}
}