JSFiddle - React, Tailwind, and code Playground

HTML

<div class="embed-container">
   <iframe 
      src="http://www.youtube.com/embed/rtVLauHXumE" 
      frameborder="0">
   </iframe>
</div>

CSS

.embed-container {
    position: relative;
    padding-bottom: 56.25%; /* 16/9 ratio */
    padding-top: 30px; /* IE6 workaround*/
    height: 0;
    overflow: hidden;
}

.embed-container iframe,
.embed-container object,
.embed-container embed {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}