1 pixel gap between window top and menu bar

MacOS Mojave 10.14.6 MacBook Pro (13-inch, 2017, Two Thunderbolt 3 ports)

I have a 1 pixel gap between the top of the window and menu bar and I can't move the window close to the menu bar.

Is there any way to solve this problem?

Solution 1:

This appears to be the design of the Safari window. Safari (and other Apple apps) have a grey shadow border in dark theme and black in light theme :

It seems the color of the border is unaffected by the background - here is dark mode with colorful wallpaper and the border is still grey.

Whereas Firefox keeps a black border for both themes and so it doesn't show in dark mode.

Looking at other apps there seems to be a mix. Word acts like Safari while ITerm2 acts like Firefox.

There doesn't seem to be any way to remove this in Mojave - see this question. Older fixes/tweaks (like Toggle OSX shadows) don't work any more.

Solution 2:

Yes - I solve this by coloring the top part of my desktop to match the shadow color.

That way, we don’t need to mind the gap.