iceweasel-start-page/content-src/components/A11yLinkButton/_A11yLinkButton.scss

.a11y-link-button {
  border: 0;
  padding: 0;
  cursor: pointer;
  text-align: unset;
  color: var(--newtab-link-primary-color);

  &:hover,
  &:focus {
    text-decoration: underline;
  }
}