.youtube-embed {
  width: 100%;
  height: 100vh;
}

.youtube-embed__ratio {
  position: relative;
  width: 100%;
  aspect-ratio: 16/9;
  overflow: hidden;
  height: 100%;
  background-color: var(--colour-grey);
}

.youtube-embed__ratio iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  margin: auto;
  border: 0;
  display: block;
}


@media screen and (min-width: 990px) {
  .youtube-embed__ratio iframe {
    width: var(--page-width);
  }
}