My vaults contain a lot of more or less atomic pages. They are the base to create superior pages, which are to publish, export and so on.
Those pages contain some internal blocks a lot of embedded blocks. At the moment the lines before an behind the embedded block blowup the superior pages und make them less readable.
What I suggest is the posibility to supresse this lines to get a result page as stream of blocks without those lines. If I want to have such a line, I can insert it by my own.
I also found these lines annoying. I found this css snippet, it removes the lines of embedded parts and you can play with the margins on the top and bottom: