Scrollbar for multi-level lists. How to do?

Hi. Is there a website gb.tmweb.ru where on the screens with a height of less ~820px (laptops) drop-down list "product Catalog" (upper left corner) is impossible to get to the last paragraphs. Accordingly, I tried to do a scroll for this list. Asked height + overflow-y:scroll for a list of the first level, but then there is horizontal scrolling on hover on the items in this list.
April 19th 20 at 12:13
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