JSFiddle - React, Tailwind, and code Playground

HTML

<div id="box">
        <p id="hover">Hi</p>
        <div id="mask">UNSICHTBARER TEXT</div>
    </div>

CSS

#box {display:block;background:#333;}
#maske {display:none;}

JavaScript

$('#hover').hover( 
    function() {$('#mask').show();},
    function() {$('#mask').hide();}
);