.frame {
  --_width: var(--frame-width, 16);
  --_height: var(--frame-height, 9);

  aspect-ratio: var(--_width) / var(--_height);
  overflow: hidden;
  display: flex;
  justify-content: center;
  align-items: center;
}

.frame img,
.frame video {
  inline-size: 100%;
  block-size: 100%;
  object-fit: cover;
}