message: fix(TableOfContents): added max-width for select text on mobile view
  Added width so the select text don't overlap the icon on mobile view
diff: border: none;
  background-color: transparent;
  height: carbon--rem(48px);
  - width: 100%;
  + width: 90%;
  appearance: none;
  @include carbon--type-style(body-short-02);
  @include focus-outline('reset');
  