Website usability issue

[Thomas Pircher]

On 2016-04-28 19:36, Werner Koch wrote:
> Neither me, thus it is not easy to debug.  However, I noticed it some
> time ago at someone else browser.

I can see this too (FF 45.0.2 on Debian testing).
But if you change the top: value in for the "nav ul li:hover 
ul.sub-menu" selector in your CSS file from 39px to 37px, then the 
problem disappears for me. I'm not a web designer, so I'm not sure this 
is the 'proper' fix for the gap.

Cheers
Thomas