Hide in a dashboard group a widgets

I am searching for a post here in the forum which i cannot find anymore.
Here was described how to hide in a dashboard group with several (i hope that's what it's called) widgets one of them.
in my example i wound like to change background to transparent for Timer 3

I would also be happy to know how to change the background color to transparent or any other color, so that the background image of the group is visible.
But this should not affect the whole node red dashboard.
I hope someone can help me.

something like this ? Changing background of any widget

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