JSFiddle - React, Tailwind, and code Playground

HTML

<div class="floated">1st</div>
<div class="floated">2nd</div>
<div classs="clear"></div> <!-- Acts as a wall -->
<section>Below</section>

CSS

div {
    border: 1px solid #f00;
    width: 200px;
    height: 100px;
}

div.floated {
    float: left;
}

.clear {
    clear: both;
}