JSFiddle - React, Tailwind, and code Playground

HTML

<div id="container">
    <div id="div1">div#1</div>
    <div id="div2">
        <div>div#2 inner</div>
    </div>    
</div>

CSS

#container
{
    color: white;
    margin-top: 50px;
}
#div1
{
    float: left;
    width: 30%;
    background-color: black;
}
#div2
{
    float: left;
    width: 70%;
}
#div2 > div {
    margin-left: 20px;   
    background-color: blue;

}