JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
    <div class="square"></div>
    <div class="square"></div>
    <div class="square"></div>
</div>
<div class="container">
    <div class="square"></div>
    <div class="square"></div>
    <div class="square"></div>
</div>

CSS

.container {
    background: #ccc;
    width: 200px;
}
.container:before, .container:after{
    content: ' ';
    display: table;
}
.square {
    margin: 10px;
    height: 50px;
    background: #f0f
}