JSFiddle - React, Tailwind, and code Playground

HTML

<div class="video">
<iframe width="560" height="315" src="https://www.youtube.com/embed/-YIyDTaK1fE" frameborder="0" allowfullscreen></iframe>
</div>

CSS

.video {
	position: relative;
	padding-bottom: 56.25%;
	padding-top: 25px;
	height: 0;
}
.video iframe {
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
}