JSFiddle - React, Tailwind, and code Playground

HTML

<div class="margin">
    <div class="container">
        <div class="box one"></div>
        <div class="box two"></div>
        <div class="box three"></div>
    </div>
</div>

CSS

.margin {
    border:3px solid #000000;
}

.container {
    display:flex;
    flex-wrap:wrap;
    margin:-10px 0 0 -10px;
}

.box {
    height:100px;
    background-color:#555555;
    margin:10px 0 0 10px;
    flex-grow:1;
    min-width:300px;
}