JSFiddle - React, Tailwind, and code Playground

HTML

<ul id="NavList">
    <li id="Home"><a href="Second.aspx"></a></li>
    <li id="About"><a href="Second.aspx"></a></li>
</ul>

CSS

#Home {
    background-color : #999;
}

#Home:hover {
    background-color : #000;
}