JSFiddle - React, Tailwind, and code Playground

HTML

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

</div>

CSS

.container {
    display: flex;
    display: -webkit-flex;
    display: -moz-flex;
    flex-flow: row wrap;
    -webkit-flex-flow: row wrap;
    -moz-flex-flow: row wrap;
}

.container .item { width: 23%; height: 180px; background: red; margin: 0 1% 20px; }