Bugs and Suggestions

1. Missing <input> and <span> in the preview;
2. Your numbered list has been converted into a proper <ol>, losing the line breaks between items;
3. Subtly different colouring for <code> / `code` elements;

@media (min-width: 800px) and (max-width: 1023px) {
  .article-container-parts .article-left-sidebar {
    display: none;
  }
}
@media (min-width: 757px) and (max-width: 800px) {
  .article-container-parts .article-left-sidebar {
    display: none;
  }
}
@media (max-width: 756px) {
  .article-container-parts .article-left-sidebar {
    display: none;
  }
}