JSFiddle - React, Tailwind, and code Playground

HTML

<div class="contentor">
    <div class="div1">a</div>
    <div class="div2">b</div>
    <div class="div3">c</div>
    <div class="div4">d</div>
</div>

CSS

.contentor
{
    width: 100px;
    overflow: hidden;
}

.contentor > div
{
    width: 50%;
    float: left;
    box-sizing: border-box;
}