I tried to add header menu to my website: https://www.am-cycling.com/
I activated header contact info, then I created menu and checked “header menu”. In css I found out that each item in menu has size 1x1px.
Also I cannot change backgrodund colors on menus. I wrote some css code to change it, but I cannot do it while customization.
I check that turning off all plugins and removing my css does not help.
Could you check what could happend?