How can I alter the color of a specific tab on my main menu?

Topic summary

Issue: A store owner wants only the “Shop by Brands” tab in the Shopify main menu to have a different color.

Proposed step: A responder outlined how to edit the theme’s CSS (Cascading Style Sheets) via Online Store > Themes > Edit code, then adding a specific selector in the theme’s CSS file to change the tab’s font color to red. A screenshot was provided showing the result.

Latest update: The requester clarified they want to change the tab’s background color instead of the font color. No finalized CSS for background color was provided yet, and the thread remains unresolved.

Summarized with AI on January 2. AI used: gpt-5.

I’m sorry for the confusion. How about if I want to change its background color?