Please use one topic for only one question.
The sub-menus are too far away from the menus and so the sub menus disappear when you try to click them.
2nd question. Does the HTML version have the classes to make
menu > sub menu > sub sub menu?
For fix sub-menus bug you should remove margin top property in theme.css line 353. See attached screen.
Unfortunately we don’t have styles for menu > sub menu > sub sub menu
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