.vimeo-viewport-wrapper {
  max-height: calc(100vh - var(--header-height));
  min-height: 200px;
  aspect-ratio: 16 / 9;     /* maintain video proportions */
  overflow: hidden;
  position: relative;
}

.vimeo-viewport-wrapper iframe {
  width: 100%;
  height: 100%;
  position: absolute;
  inset: 0;
}