message: [Dark theme] Styling to support co-hint-blocks
diff: .co-hint-block {
  - background-color: $pf-color-blue-50;
  - color: $pf-color-blue-600;
  - padding: 10px 15px 10px;
  + background-color: var(--pf-global--BackgroundColor--400);
  + border: 1px solid var(--pf-global--BorderColor--300);
  + color: var(--pf-global--Color--100);
  + padding: var(--pf-global--spacer--lg);
  }
  