Title background for calendar

[mlb]

calendar - Make color for Category the background color for Title

[Jon]

Thanks for submitting an idea to the Mozilla Connect community! Your idea is now open to votes (aka kudos) and comments.

[Agentvirtuel]

Hello

Unless I have misunderstood.

Take a look at https://connect.mozilla.org/t5/ideas/thunderbird-calendar-display-of-categorized-appointments/idi-p/... and if you wish to test userChrome.css

/* Calendar  - set event category colour instead of calendar colour */

.calendar-category-box{     margin:0 0 0 -200px !important;     min-width: 200px !important;     }    
.alarm-icons-box,.reminder-icon{     margin:0 0 0 0!important;     }    
.event-name-label,.item-time-label,.alarm-icons-box,.reminder-icon{     z-index:100000!important;     }     
.calendar-item-flex{     padding:0!important;     }     
.calendar-month-day-box-list-item{     margin:0!important;     }     
.calendar-color-box{     border:none!important;     }      
.event-name-label{     color: #00ff00 !important;     white-space:break-spaces !important;     }

Copy/paste the code into Notepad
Save
Type: All files
userChrome.css

Create a chrome folder
Move userChrome.css to your chrome folder

Go to your profile folder https://support.mozilla.org/en-US/kb/profiles-where-thunderbird-stores-user-data#w_how-do-i-find-my-...

Move your chrome folder to your profile folder

Go to Configuration Editor https://support.mozilla.org/en-US/kb/config-editor
Enter a search term toolkit.legacyUserProfileCustomizations.stylesheets and set its value to true

Restart Thunderbird.

By way of illustration

About

.event-name-label{     color: #00ff00 !important;     white-space:break-spaces !important;     }

Others colors according to your preferences.
https://www.w3schools.com/colors/colors_picker.asp

If you modify userChrome.css, restart Thunderbird.

Additional information
https://support.mozilla.org/en-US/kb/userchromecss-js-usercontent-unsupported