JSFiddle - React, Tailwind, and code Playground

HTML

<div class="foo">
    <div class="bar">A</div>
    <div class="bar">A</div>
    <div class="bar">A</div>
    <div class="bar">A</div>
    <div class="bar">A</div>
    <div class="bar">A</div>
    <div class="bar">A</div>
    <div class="bar">A</div>
    <div class="bar">A</div>
    <div class="bar">A</div>
    <div class="bar">A</div>
    <div class="bar">A</div>
    <div class="clear"></div>
</div>

CSS

.foo {
    background-color: #ccc;
    width: 180px;
    margin: 0 -10px;
}

.bar {
    background-color: #888;
    float: left;
    margin-left: 10px;
    width: 20px;
}

.clear {
    clear: both;
}