JSFiddle - React, Tailwind, and code Playground

by nkovacs

HTML

<div class="container">
    <div class="test">
    </div>
</div>

CSS

.container {
    overflow: hidden;
    width: 10px;
    top: 0;
    bottom: 0;
    left: 0;
    position: fixed;
}

.test {
    opacity: 0.3;
    background: red;
    transition: all 300ms ease-in-out;
    width: 40px;
    height: 40px;
    position: fixed;
    top: 0;
    left: 0;
}

.test:hover {
    opacity: 1;
    width: 80px;
    height: 80px;
}