Hi, I posted previously that duplicate class did not work. Later that evening I told Dave it did work. This morning the problem is back. See video.
There is a thin line under the menu that is a div of 1 pixel height with a background color. When duplicating a class that has nothing to do with it, this div becomes a fat block, but still with the property of 1 pixel height. It seems to have the default height of a new div or container. Other lines in the neighbourhood expand as well. At the end of the video you can see between ‘overzicht’ and ‘cursussen’ a div with a top line. This is the same problem. This is a div of 1 pixel height with a top border of 1 pixel height, so no background color.
Please help, this is a disaster.Screen Recording 2017-08-02 at 10.15 AM.mov