JSFiddle - React, Tailwind, and code Playground

HTML

<div id="player">
    <iframe width="420" height="315" src="//www.youtube.com/embed/9e0TNih-XfQ" frameborder="0" allowfullscreen></iframe>
    
    <div id="your-ad">
        <img src="http://placehold.it/300x250&text=Ads" />
    </div>
</div>

CSS

#player{
    position: relative;}

#your-ad{
    position: absolute
    width: 300px;
    height: 300px;}