What a UI mess Evernote has in macOS 10.13 High Sierra. We have the sidebar, which uses macOS Vibrancy to make it slightly translucent. Then we have the note list, which is what I'd call a "Mavericks grey". Finally, we have the note and it's new Mojave dark background… with a lighter grey header. Either have a dark mode that works in High Sierra (like Things 3), or disable it.
So, 3 panes, and 4 different colors. Meanwhile, Bear has it's theme act together, as well as Apple Notes.
I know it's only beta 1, but this is not what we had in mind when we asked for a Dark Mode all those years ago.