In version 9 of the Atomic Calendar Revive I removed all of the color and style Options, this decission was made due to numerous requests for different styling to be added and it was becoming unmanageble.

Instead I have now added numerous classes throughout the card, moved to a div orientated layout which allows for much more customisation with the use of the amazing card-mod

The below video shows you how to find the various classes and add styling with card-mod, if there are classes missing that you need, log a feature request and I will aim to get that added.

Atomic Calendar Revive and card_mod