.post-cover {
  width: 100%;
  max-height: 420px;
  object-fit: cover;
}

.post-content img,
.post-content video,
.post-content iframe {
  max-width: 100%;
  height: auto;
}

.post-content iframe {
  width: 100%;
  aspect-ratio: 16 / 9;
}