JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
<iframe src="//www.youtube.com/embed/yCOY82UdFrw" 
frameborder="0" allowfullscreen class="video"></iframe>
</div>

CSS

.container {
    position: relative;
    width: 100%;
    height: 0;
    padding-bottom: 56.25%;
}
.video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}