background-color: #FF0000 !important;

I have been using the Calendar Tweaks add on to color event box background by category instead of simply adding a flair on the right side. (Similar to the functionality of Outlook). However, since this Add On is no longer maintained and supported by the devs, it will not be updated to be compatible with the newer version. Hence upon upgrading to TB 78.3.2, I have tried to replicate this funtionality using the ChromeUser.css file and enabling toolkit.legacyUserProfileCustomizations.stylesheets from the config editor. However, lacking the knowledge of the current structure of functions and exact nomenclature, this is proving difficult. Currently I have used the following script which obviusly does not work as it is outdated. ''.calendar-color-box[categories~="myCategory"], .calendar-event-box-container[categories~="myCategory"] { background-color: #FF0000 !important; }'' I would appreciate if someone could provide corrections for the same or provide an alternative customisation method which will not be affected by subsequent updates.