Rework blur for better visibility of buttons

[Morphclue]

Context

Some users I've spoken with had the problem that the blur confused them a bit / that the checkbox next to the submit button has bad readability.

In addition to that it would look better if the blur wouldn't contain artifacts around rows.

[ShivRaiGithub]

I can work on it. Please assign it to me and assign it the hacktoberfest label. Thank you