Help with prefers-color-scheme: dark CSS?

Hi all,
I think this is my first post so I’m not sure if this is the correct space for this. I don’t think this is only relevant to my theme, but general help with CSS that I couldn’t find explained elsewhere.

I’m working on configuring an automatic dark mode for my site via prefers-color-scheme. So far, I’ve managed to change the background and most elements within the body (h1-h4, p, li, tr), as well as the background color for text fields for comments.

I’m having trouble figuring out the CSS for a few things;

– on each post’s metadata, ‘posted in _____’ and ‘tagged’
– an image’s caption text color
– button’s background and text color for Search and Post a Comment

These changes are only visible to those with dark mode’s enabled on their systems, such as dark mode on iOS13.

Thanks and apologies if this is not the correct forum for it. WordPress newb here 👋🏼.

The page I need help with: [log in to see the link]