.post-body img {
  margin-left: auto;
  margin-right: auto;
}

.sketch-frame {
  width: min(100%, 720px);
  height: var(--sketch-frame-height, 420px);
  margin: 0.35rem auto;
  border: 3px solid #0a39ff;
  overflow: hidden;
  background: linear-gradient(180deg, #0a39ff 0%, #0a39ff 58%, #7bbcff 100%);
  display: block;
}