<div id="video">
	<div class="videoWrapper">
		<iframe width="560" height="315" src="https://www.youtube.com/embed/Zph3K-----" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen=""></iframe>
  	</div>
</div>

CSS:

#video {
    max-width: 560px;
    margin: 0 auto;
}
.videoWrapper {
    position: relative;
    padding-bottom: 56.25%;
    padding-top: 25px;
    height: 0;
}
.videoWrapper iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}