Stack Overflow answer

https://stackoverflow.com/questions/69257725/html-how-to-force-a-video-wrapper-to-autoresize-to-the-page-layout

by umbertofontanazza

HTML

<style>
.pages-content .video-wrapper {
  padding-top: 0px;
  padding-bottom: calc(600/1920*100%);
  margin-top: 25px;
}

.video-wrapper video {
  width: 100%;
}</style>

CSS

.pages-content .video-wrapper {
  padding-top: 0px;
  padding-bottom: calc(600/1920*100%);
  margin-top: 25px;
}

.video-wrapper video {
  width: 100%;
}