Current onclick region in red, favored in blue
I'm reposting the comment https://bugzilla.wikimedia.org/show_bug.cgi?id=40307#c8 as a separate bug.
It's nice to have the close button (the little "x") on the popup. This way everybody can see it's possible to make the popup go away without trying to click it.
But: The onclick region is way to small (red rectangle in the attached screenshot). The popup goes away very fast and it's almost impossible to hit the small "x" in that short time. The region should be much, much bigger. At least the blue rectangle. Even with such a big onclick region nothing is obfuscated. Clicking the close button by accident is not possible. It's still possible to select the text (if you are fast enough to do this).