Background Color on Text / Adjusting Collection Card size

Hi, my site currently looks like this:

I want to do the following:

  1. fill the collection card with the entire image - no crop.

  2. add a black background with white text to the Header.

  3. reset what I see inside my editor?


Here is my site Read-Only: LINK
(how to share your site Read-Only link)

  1. Answered here: