JSFiddle - React, Tailwind, and code Playground

HTML

<div class="first"></div>
<div class="second"></div>

CSS

body {margin: 0;}
div.first {
    margin: 10px auto 10px 10px;
    background-color: #fefd8f;
}
div.second {
    margin: 10px 10px 10px auto;
    background-color: #f6ccfc;
}
.first, .second {
    border: 1px solid #8d8d8d;
    width: 66%;
    height: 100px;
    box-sizing: border-box;
    -moz-box-sizing: border-box;
    -webkit-box-sizing: border-box;
}