JSFiddle - React, Tailwind, and code Playground

HTML

<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>

CSS

.item {
    width: 33%;
    height: 100px;
    background: green;
    margin: 1px;
    display: block;
    float: left;
}
.item:hover {
    background: blue;
}