JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
    <div class="left">
        <div class="red">Red</div>
        <div class="green">green</div>
    </div>
    <div class="blue">blue</div>
</div>

CSS

.container{border: 2px solid black; padding: 5px; position: relative; width: 100%;}

.left {
    float: left;
}

.left div {
    float: left;
}

.red{border: 2px solid red;}

.green{border: 2px solid green;}

.blue{border: 2px solid blue;}