The night mode currently is a “Mirror” like blue. What about Anchor Black?
The header is consistently black, and the blue contrasts with the black to separate the header from the main content, and also to indicate which tab is selected. Making it all completely black would eliminate this contrast.
I personally think the charcoal/dark-grey color, which is the background of the Anchor logo (as seen on the forum site, the docs site, and as used for the token) would be a good option. (Very similar to the dark grey used for the forum site)
While we’re at it, I think the logo in the header of the web-app (used to Go To Dashboard) doesn’t look as good as the regular logo of the token.