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Scrolling a drop down menu/section for smaller screens

I have a background video playing on the site I am working on. To keep the attention on the video I’ve put the heading and the menu in a drop-down style menu but the problem I have is that in smaller screen the menu overflows the screen and for some reason, I can’t scroll down.

I am trying to figure out either how to make the size of the whole thing smaller or make it scrollable without scrollbar showing or some other creative way to fix the problem. Also, any tips on the rest of the structure of the page are very much appreciated.

Thank you.

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