JSFiddle - React, Tailwind, and code Playground

HTML

<ul id="main-nav">
    <li><a href="#">one</a></li>
    <li><a href="#">two</a></li>
    <li><a href="#">three</a></li>
</ul>

CSS

#main-nav {
    list-style: none;
    margin: 0;
    padding: 0;
    width: 100%;
    overflow: auto;
    background: blue;
}
#main-nav li {
    display: inline;
    background: red;
    float: left;
    margin: 0;
    padding: 0;
    text-align: center;
}
#main-nav li a {
    display: inline-block;
    padding: 5px;
    margin-right: 5px;
    text-decoration: none;
    background-color: #e0e0f0;
    font-weight: bold;
    color: #021020;
}
#main-nav li a:hover {
    background-color: #498cd5;
    color: #ddeeee;
}