JSFiddle - React, Tailwind, and code Playground

HTML

<div id="container">
    <div id="right"></div>
    <div id="center"></div>
</div>

CSS

#container {
    height: auto;
    overflow: hidden;
}

#center{
	background-color: green;
    width: auto;
    height: 20px;
    overflow: hidden;
}

#right{
	background-color: red;
    float: right;
    height: 20px;
    width: 200px;
}