The background color of the Guideline can be changed if you are using the Classic or Muse theme, but not in the Legacy theme. You can find out more about Themes here and about changing the background color here. Related ArticlesCan I change the background color of a block in the Guideline?Can I change the background color for the Guideline icons in the Dashboard view?Color Schemes - Customize your Guidelines backgroundColor Schemes - FAQGet started with Themes