JSFiddle - React, Tailwind, and code Playground

HTML

<div id="container">
    <div id="colordiv">
        
    <div></div>
    <div></div>
    <div></div>
        
    </div>
</div>

CSS

#container {width:70%;background:black;
    margin:auto}

#colordiv {background:black;width:100%;float:left;}
#colordiv div{width:200px;float:left;
    margin-top:20px;
    margin-left:30px;
    background:blue;height:200px;}