JSFiddle - React, Tailwind, and code Playground

HTML

<div class="wrapper">
    <div class="container">
        <div class="left box">Content</div>
        <div class="right box">Content</div>
    </div>
</div>

CSS

.wrapper {width:100%; text-align:center}
.container {margin: 10px auto}
.left {width:69%;max-width:350px; background:blue}
.right {width:29%;max-width:150px; background:red}
.box {float:left;padding:20px}