Resize Embedded Script or Code box

https://www.ellijaymushrooms.com/online-store
Password for page is shiitake

The issue here is when I try to resize the height of the block I simply can't so what ends up happening is the block layer level or z-index ends up overlapping. It appears to me that because Squarespace adds a bunch of info in the block that you just cant resize it properly.

Either way, any idea how to fix this?  The 1st image below show the blocks layer with the height as small as I can go and the second image shows that the menu flows behind the block below. Now I could switch the layer level making the top block top most layer but then you can't select the category boxes below.

Any help would be amazing! Thanks.

Man you are amazing!  Really appreciate the time it took to offer a solution 🙂