JSFiddle - React, Tailwind, and code Playground

HTML

<div id="wrapper">
    <div id="left"></div>
    <div id="rightWrapper">
        <div id="right"></div>
    </div>
</div>

CSS

#wrapper {
    margin:0 30px;
}

#left {
    width:70%;
    height:200px;
    background:black;
    float:left;
}
#rightWrapper {
    margin-left:99px;
}
#right {
    width:30%;
    height:200px;
    float:right;
    background:grey;
}