JSFiddle - React, Tailwind, and code Playground

HTML

<div class="clearfix">
    <div class="l"></div>
    <div class="r"></div>
    <div class="c"></div> 
</div>

CSS

.clearfix:after {
    content: ".";
    display: block;
    clear: both;
    visibility: hidden;
    line-height: 0;
    height: 0;
}

.l {
    width: 100px;
    height: 100px;
    float: left;
    background: red;
}
.r {
    width: 100px;
    height: 100px;
    float: right;
    background: blue;
}
.c {
    height: 100px;
    overflow: hidden;
    background: green;
}