JSFiddle - React, Tailwind, and code Playground

HTML

<div id="main">
    <div id="content">
        <div style="padding-left:200px">
        Context
        </div>
    </div>        
    <div id="sidebar">sidebar</div>    
</div><!--#main-->

CSS

#content {
    background: blue;
    height: 900px;
    width:100%;
    margin-left:-200px;
    float:right;
    color:#fff;
}

#sidebar {
    float: left;
    width: 200px;
    height: 900px;
    background: red
}