JSFiddle - React, Tailwind, and code Playground

HTML

<div id="container">
    <div class="child-item"></div>
    <div class="child-item"></div>
    <div class="child-item"></div>
    <div class="child-item"></div>
    <div class="child-item"></div>
    <div class="child-item"></div>
</div>

CSS

#container {
    align-content: flex-start;
    background-color: red;
    display: flex;
    flex-flow: row wrap;
    height: 13rem;
    justify-content: space-around;
    padding: 2.5%;
    width: 75%;
}

.child-item {
    background-color: yellow;
    flex-basis: 4.5rem;
    flex-grow: 1;
    height: 20px;
    margin: 10px;
    width: 75px;
}