JSFiddle - React, Tailwind, and code Playground

HTML

<div id="content">
    <iframe width="560" height="315" src="//www.youtube.com/embed/if05nLsUHyk" frameborder="0" allowfullscreen></iframe>
</div>

CSS

#content {
    width: 50vw;
    margin:auto;
}
#content iframe {
    width: 50vw;
}