rrmrk is too white

Only happens on my phone. It looks normal on my iPad and my computer.

How does one change this?

I think it might be a setting on your phone itself... I just checked on my own phone, and it shows the normal darker theme, even without me being logged in or anything. Try logging in via your phone, going to the theme settings, select whatever you want, log out, and revisit the site. See what happens from there. Could just be an issue with that particular phone though. What are you using?

There's a small purple square on the far right above the box that shows your tiny avatar and PMs and stuff. On a computer, clicking it switches between the light and dark themes. It's in your screenshot, so try it out. Might not work on your phone, but it should.

Fixed it!