Is there a way to have just a background image that shows top to bottom on the page, as opposed to having something different in the header area? I’d like the header area to just be transparent and have the background image visible throughout.
Yes, the header area can be made transparent so the background image will show through.
In the customizer, go to ‘Header and Menu Styling’ and in the setting for ‘Header Background Color’ slide the transparency setting all the way to the left to 0 (zero).
Setting this to zero will make the header transparent across the whole site.
If you want a transparent header only on the homepage, set your preferred background color (for the whole of your site) as above, and then add this CSS to ‘Additional CSS’:
Ahh yes I see what you mean now.
I initially assumed it was the homepage image that you wanted to show through, but I can now see it is the body background image that you need to show through the site header.