message: fix(md-enhance): fix footnote position on mobile
diff: margin-top: calc(0rem - var(--navbar-height));
  padding-top: calc(var(--navbar-height) + 0.5rem);
  + @media (max-width: hope-config.$pad) {
  + margin-top: calc(0rem - var(--navbar-mobile-height));
  + padding-top: calc(var(--navbar-mobile-height) + 0.5rem);
  + }
  +
  & > p {
  margin-bottom: 0;
  }
  margin-top: calc(0rem - var(--navbar-height) - 0.5rem);
  padding-top: calc(var(--navbar-height) + 0.5rem);
  + @media (max-width: hope-config.$pad) {
  + margin-top: calc(0rem - var(--navbar-mobile-height) - 0.5rem);
  + padding-top: calc(var(--navbar-mobile-height) + 0.5rem);
  + }
  +
  .footnote-anchor {
  position: absolute;
  top: 0;
  