Rated 5 out of 5 stars

Very good! :)

Can You add option to change background color of today and selected day in Day View?

This review is for a previous version of the add-on (6.1).  This user has other reviews of this add-on.

Calendar Tweaks already has options to change the background colors for Today and the Selected Day. These colors apply in all views including the Day View.

In all views, if the Selected Day is today, then the Selected Day colors take priority over the Today colors. This means that in the Day View the background color will always be the Selected Day color.

Are you looking for an option, so that the Today colors would take priority in the Day View?