JSFiddle - React, Tailwind, and code Playground

HTML

<div class="parent">
    <div class="child">1</div>
    <div class="child">2</div>
    <div class="child">3</div>
    <div class="child">4</div>
    <div class="child">5</div>
    <div class="child">6</div>
    <div class="child">7</div>
    <div class="child">8</div>
    <div class="child hidden">9</div>
    <div class="child hidden">10</div>
</div>

CSS

.parent {
    background: red;
    max-width: 500px;
    height: 400px;
    display: flex;
    flex-wrap: wrap;
}

.child {
    background: blue;
    min-width: 130px;
    margin: 10px;
    flex-grow: 1;
    color: #FFFFFF;
    text-align: center;
    line-height: 50px;
    font-size: 60px;
}

.hidden {
    visibility: hidden;
    height: 0;
    font-size: 0;
    margin: 0 10px;
}