/* Fill only the corner cutouts of fixed headings with the page surface. */
#form.natural-stack .form-card-heading.is-pinned::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  box-shadow: 0 0 0 24px #f4f6f5;
  clip-path: inset(0);
  pointer-events: none;
}