I prefer a light background with dark foreground for my forums, and use the prosilver theme when I am logged in. But, I also view the forums from different devices where I am not logged in, and they always default to the blue on black theme. So I googled a bit and found that people not logged in, can also change the theme of viewing on the url for phpbb.
Try
Code: Select all
https://theskysearchers.com/?style=1
or
https://theskysearchers.com/index.php?style=1
You can also change the style numbers to try out different themes.
There are some posts on the web, of this not working on some phpbb versions, so it is possible that an upgrade will change this behavior, but there will probably be settings for admins to keep this working.