JSFiddle - React, Tailwind, and code Playground

HTML

<div id="boxes">
    <div class="box">Box1</div>
    <div class="box">Box2</div>
    <div class="box">Box3</div>
</div>

CSS

#boxes {
    width: 800px;
    background-color: yellow;
    
    float: left;
}

#boxes .box {
    width: 100px;
    height: 100px;

    margin: 10px;
    float: left;

    background-color: blue;
}