JSFiddle - React, Tailwind, and code Playground

HTML

<div class="top">
<div class="wrapper">
<iframe src="https://player.vimeo.com/video/236241664?title=0&byline=0&portrait=0&transparent=0&autoplay=1" width="640" height="480" frameborder="0" title="Funny Cat Videos For Kids" webkitallowfullscreen="" mozallowfullscreen="" allowfullscreen="" data-ready="true"></iframe>
</div>
</div>

CSS

.top {
  padding-bottom: 56.25%;
  height: 0;
  overflow: hidden;
  position: relative;
}

iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

.wrapper {
  position: relative;
  padding-bottom: 200%;
  transform: translateY(-35.95%);
}