JSFiddle - React, Tailwind, and code Playground

by lbstr

HTML

<ul>
    <li></li>
    <li></li>
    <li></li>
</ul>

CSS

ul:hover li { opacity: 0.5; }
ul li:hover { opacity: 1; }
li { 
    background-color: blue;
    float: left;
    width: 100px;
    height:300px;
    border: 1px solid black;
}