How to reduce padding in between page sections (7.1) ?

Site URL: https://rhombus-watermelon-ya5p.squarespace.com/selectedwork/thehideaway

Hi,

https://rhombus-watermelon-ya5p.squarespace.com/selectedwork/thehideaway
website password: 1234

I'd like to reduce the white space/ padding in between my page sections - specifically

- between header and the video block

-the video block to text block

- text block to gallery block

There's too much padding overall and I'd have to do this to my portfolio project by project, any help is much appreciated, thank you!