JSFiddle - React, Tailwind, and code Playground

HTML

<ul>
    <li>1</li>
    <li>2</li>
    <li>3</li>
    <li class="active">4</li>
    <li>5</li>
</ul>

CSS

ul li{
    float: left;
    list-style: none;
    background: red;
    margin-left: 20px;
    display: block;
    padding: 20px;
}

.active{
    
}