JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
    <div class="item">1</div>
    <div class="item">2</div>
    <div class="item">3</div>
    <div class="item">4</div>
    <div class="item">5</div>
    <div class="item">6</div>
</div>

CSS

.container {
    border: 1px solid red;
    width: 810px;
}

.container > .item {
    border: 1px solid blue;
    display: inline-block;
    margin-right: 10px;
    width: 190px;
}

.container > .item:nth-child(4n) {
    margin-right: 0;
}