JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
    <iframe src="https://www.youtube.com/embed/m7E5Z2MTrNk" frameborder="0" allowfullscreen></iframe>
</div>

CSS

.container {
   width:90vw;
   height:50vh;
}

.container iframe {
  width: 100%;
  height: 100%;
}