The Groups.io menus are less visually noticeable than they could be. The content on the page contains lots of blue and white space, various symbols ( [ … etc.
The menus are gray and the text seems smaller — though it may be the effect of the color and variation of the main content. If the point size were 1-2 points larger I don’t think I would have to point out the menu to people as often, if ever. The addition of a standard color for the menu background might also help. I like the nice clean black, white, and blue palette, but a pale grey or blue wouldn’t clutter or distract.
Sharon Villines, Washington DC
"Design is the first sign of human intention." William McDonough