.substack-embed {
  width: min(100%, 480px);
  margin: 1.75rem 0 0;
  overflow: hidden;
  border-radius: var(--radius);
  box-shadow: 0 10px 30px rgba(20, 30, 40, 0.08);
}

.substack-embed iframe {
  display: block;
  width: 100%;
  max-width: 480px;
  height: 320px;
}