some entries below the main menu items are cut on the screen when I use the site in smartphone version (Iphone 6 and Android phone), This is the website: http://www.venber.it/
If you try to navigate on it using a smartphone and, for example, go to the item:
Your submenu item labels are too long to fit in the width of the mobile screen (so they overflow).
You should try to rename them to an acceptable length.