Is there a way to get a dark theme/night mode on here. I really love the site but all of that white burns my eyes in the evening:)

While I 100% support adding a dark theme to any site, I use a chrome extension called Deluminate:

https://chrome.google.com/webstore/detail/deluminate/iebboopaeangfpceklajfohhbpkkfiaa

I have the same issue with bright sites and the settings on this extension are site specific, and it's easy to turn on and off. Hopefully this can help you out. Sorry if it's not really what you're looking for! I just know the struggle with sites without a night mode so I wanted to help if I could. I've even custom made my own dark theme for sites I use a lot that don't have them haha.

Here's a screenshot of what Deluminate does to completionator: http://i.imgur.com/fC1kk6B.png

Thank you very much for the link to Deluminate. I didn't know that it whas there.
Keeps me from struggling with userstyles.

/Edit: After using it on a few more sites it really seems to be hit and miss if it works correctly. Most site give me a strange color background and mostly light.