Remove shadow and decrease space

Hi.

I have three questions.

1. How can I remove the shadow around the info at check-out? See my attached image.
2. How can I decrease the space between the different elements? See my attached image.
3. There seems to be several quantity indicators above each other. Do you know how I can solve this? I think that something has to do with the theme I use. See my attached image.

https://drive.google.com/file/d/1Fgot88JoHr0QOsacIk9Zc99SXiuoEUWi/view?usp=share_link

https://drive.google.com/file/d/1STJLvA5Uh8h8G7ub_ovh98IPYV-Y9FN6/view?usp=share_link

The page I need help with: [log in to see the link]