JSFiddle - React, Tailwind, and code Playground

HTML

<div class="drunter">
    hallo lalal
    <div class="drueber">
        tschüss lala
    </div>
</div>

CSS

.drunter {
    position:relative;
    background-color:#f00;
}
.drueber {
    position:absolute;
    top:0;
    right:0;
    bottom:0;
    left:0;
    display:none;
    background-color:#00f;
}
.drueber:hover {
    display:block;
}