JSFiddle - React, Tailwind, and code Playground

HTML

<div id="menu">
    <ul>
        <li>11111111</li>
        <li>22222222</li>
    </ul>
</div>
<div id="content">Content</div>

CSS

#menu { 
    float: left;
    border-right: 1px solid green;
}
#content { 
    background: url('http://jsfiddle.net/favicon.ico') center left no-repeat;
}