Okay, so I made a few changes on my test site, you can find it here — http://zeros-pg.wikidot.com
Everything is applied to Wanderers' Library.
As you can see, the logo is now slightly smaller so the snake doesn't "kiss" the bar, it looks okay now in my opinion, but I'd like to hear yours.
I also changed links colours, you can see them in an example forum post in the link below.
http://zeros-pg.wikidot.com/forum/t-3510071/title#post-3582114
I also decided that Gaffney does not match any existing user name is right about the centered links in the side menu, so I aligned them to the left. I hope it looks better now.
And now, for the most significant problem — I can't really fix the narrow divs, I'll now explain why.
The old theme kinda "prefers" when you use divs in your articles, if I can say so. That's because it was so wide that everything was flowing on the whole width of your monitor and divs kept these articles in place. Now the theme does that, but divs are still there, so some articles are ultra narrow.
And tbh, I can't fix it completely with theme changes, I think it might require you guys to change some articles' formatting.
The last thing is the broken mobile version, I can fix that once I get the admin permissions back. That's because it works just fine on my test site, just not here, so I'll have to look into it.
EDIT: Everything apart from mentioned divs has been fixed, but as I said, moving from such an old theme to a new, responsive one always brings problems like that, you have to change some of the articles, I really can't help it, even if I want to.
Are there any new problems spotted? How do you like new colours?