JSFiddle - React, Tailwind, and code Playground

HTML

<div class="outer">
    <div class="inner">INNER DIV</div>
    <div class="inner">INNER DIV</div>
    <div class="inner">INNER DIV</div>
    <div class="inner">INNER DIV</div>
    <div class="inner">INNER DIV
        <br /> INNER DIV
        <br />INNER DIV INNER DIV
        <br />INNER DIV INNER
        <br /> DIV INNER DIV</div>
    <div class="inner">INNER DIV</div>
    <div class="inner">INNER DIV</div>
    <div class="inner">INNER DIV</div>
    <div class="inner">INNER DIV</div>
    <div class="inner">INNER DIV</div>
    <div class="inner">INNER DIV</div>
    <div class="inner">INNER DIV</div>
    <div class="inner">INNER DIV</div>
    <div class="inner">INNER DIV</div>
</div>

CSS

.outer {
    display: flex;
    flex-wrap: wrap;
}

.inner {
    background: #fff;
    border: 1px solid #000;
    padding: 10px;
    margin-bottom: 20px;
    width:20%;
    text-align: left;
	box-sizing: border-box;
}