JSFiddle - React, Tailwind, and code Playground

HTML

<div id="left">
    Box left
</div>
<div id="content">
    Content
</div>
<div id="right">
    Box right
</div>

CSS

#left {
    float: left;
    width: 25%;
    background-color: violet;
}

#right {
    float: left;
    width: 25%;
    background-color: green;
}

#content {
    float: left;
    width: 50%;
    background-color: red;
}