Better visually separate / containerize lists

[keunes]

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Is your feature request related to a problem? Please describe. Having a single board with a couple of columns and a bunch of cards on each of them, it visually all blends together a bit.

Describe the solution you'd like Introduce a light background colour for the columns to help visualise separation. I quite like the approach shared in https://github.com/nextcloud/deck/issues/833#issuecomment-1236395490

This would of course have to be quite subtle and in the theme of the instance.

Describe alternatives you've considered Adding a 1px line between the lists, but that might even be more distracting.

Additional context Add any other context or screenshots about the feature request here.