I like the style of the forum but i don´t like the color White. Many modern development software are in dark colors. I love the theme from the Visual Studio 2013.
I found a Dark Theme for NodeBB which is really god. A little bit more color in this and it is perfect in my opinion.
White screens are so eye flashing and not modern.
A other thing is that the threads are not separated.
A clear gab between the threads that shows the background would be nice. And the Background should definitely darker then the thread preview.