JSFiddle - React, Tailwind, and code Playground

HTML

<div class="outside">
    <img class="inside" id="pic" src="https://images.duckduckgo.com/iu/?u=http%3A%2F%2Fblogs.cisco.com%2Fwp-content%2Fuploads%2Fclouds.png&f=1" height="200px"/>
</div>
<br/>
<div class="outside">
    <iframe class="inside" width="420" height="315" src="//www.youtube.com/embed/VwTnyRHEZSQ" frameborder="0" allowfullscreen></iframe>
</div>

CSS

.outside{
    background-color: red;
}