message: Meta: Highlight invalid tokens in the options
  "Invalid" as defined by the pattern attribute, they're not actually validated with GitHub.
diff: @@ -18,6 +18,10 @@ p {
  width: 20em !important; /* https://github.com/sindresorhus/refined-github/issues/1374#issuecomment-397906701 */
  }
  +[name='personalToken']:invalid {
  + border-color: var(--github-red) !important;
  +}
  +
  .feature:not([hidden]) {
  display: flex;
  }
  