JSFiddle - React, Tailwind, and code Playground

HTML

<div id="container">
    <div id="header">
         <h1><a href="index.html">Admin</h1>

        <ul>
            <li><a href="jobs.html">Jobs</a>

            </li>
            <li><a href="sites.html">Sites</a>

            </li>
            <li><a href="feeds.html">Feeds</a>

            </li>
        </ul>
    </div>
    <div id="content">Content goes here</div>
</div>

CSS

* {
    padding: 0px;
    margin: 0px;
    border: 0px;
    font-family: Helvetica, Arial;
    font-size: 13px;
}
#header {
    background-color:#1ABC9C;
}
#header a {
    color: white;
    text-decoration:none;
}
#content {
    background-color:#EEEEEE;
    padding: 20px;
}
#header h1, #header ul li, #header ul {
    display: inline-block;
}
#header ul { font-size: 0; }
#header ul li, #header h1 {
    padding: 15px 20px;
    background: #16AD8F;
}