JSFiddle - React, Tailwind, and code Playground

HTML

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

CSS

#container {
    border:1px #ff0000 solid;
    position:relative;
}
    #container:after {
        display: table;
        content: '';
        clear: both;
    }

#container .child {
    width:200px;
    height:200px;
    background:#f5f5f5;
    float:left;
}