So, if a site viewer requires an archive of posts of the ‘image’ format, WordPress will display an image at the top for each post in the archive. Following the same logic, you can dive into any post format by checking the corresponding template parts.

Twenty Twenty-One provides support for a 300×100 px custom logo. You can find Custom Logo settings in the Site Identity panel.

In the theme’s stylesheet, sizes are set in rem units.

The Theme Customizer provides a Colors & Dark Mode panel including two options:

The image below shows a light yellow background color with a dark gray text.

Background color defaults to a pastel green (‘#d1e4dd’), but site admins can easily switch between the following background color alternatives: