JSFiddle - React, Tailwind, and code Playground

HTML

<div id="Trigger">Yes</div>
<div id="Effect">Titties</div>

CSS

#Effect {
Position: absolute;
    top: 30px;
    left: 0px;
    height: 100px;
    width: 100px;
    border: solid 5px black;
    display: none;
}

#Trigger:hover + #Effect {
    display: block;
}