JSFiddle - React, Tailwind, and code Playground

HTML

<div class="youtube-container">
    <iframe src="//www.youtube.com/embed/NF-kLy44Hls" frameborder="0" allowfullscreen></iframe>
    
</div>

CSS

.youtube-container{
    position:relative;
    padding-bottom:56.25%;
    padding-top:20px;
    height: 0;
    overflow: hidden;
    max-width:100%;
}
.youtube-container iframe{
    position:absolute;
    top:0;
    left:0;
    width:100%;
    height:100%;
}