Color_S2T_SpeakerBackground
When displaying a transcript with mutliple speakers, this parameter defines the text background color of the "speakers" line. See also description of Color_S2T_SpeakerText.

You should define either both of Color_S2T_SpeakerText and Color_S2T_SpeakerBackground, or neither, to avoid unexpected color combinations.
Possible values: color values or names
Default value: (empty)