JSFiddle - React, Tailwind, and code Playground

HTML

<div class="one"></div>
<div class="two"></div>

CSS

.one {
    float:left;
    width:50px;
    height:80px;
    border:1px solid green;
}

.two {
    float:left;
    width:100%;
    height:80px;
    border:1px solid green;
}