JSFiddle - React, Tailwind, and code Playground

HTML

<div class="parent">
    <div class="inline-child"></div>
    <div class="inline-child"></div>
    <div class="inline-child"></div>
    <div class="block-child"></div>
</div>

CSS

.parent {
    width: 100%;
    background: black;
    text-align: justify;
}

.inline-child {
    display: inline-block;
    vertical-align: top;
    height: 100px;
    width: 30%;
    background: red;
}

.block-child {
    /* display: inline-block;
    width: 100%; */
}