JSFiddle - React, Tailwind, and code Playground

HTML

<div>
    <div></div>
</div>

CSS

div {
    position: relative;
    z-index: 1;
    width: 50px;
    height: 50px;
    background: red;
}
div:hover>div {
    position: absolute;
    z-index: 0;
    top: 0;
    left: 0;
    width: 70px;
    height: 70px;
    background: blue;
}