Content exceeds the viewport when using vertical flex layout

My content exceeds the viewport when my section has Flex layout vertical. This is the last problem in my website and I really hope someone can help me fix this. On mobile I now have the layout set to Block but I actually don’t want that because on the largest phone resolutions the content now isn’t vertically centered. Please note I have various interaction triggers applied to this section, that changes the layout, so I suggest only to focus on to come up with a fix for the page below on desktop. Thank you so much.

Here is my site Read-Only: LINK


I fixed the issue by adding Min-Height 100% and changing the Position from Absolute to Static on class .Section (Custom).