Changing the background color was not working because 'o_mail_snippet_general' having a background color white. while bg-* colors are applied on a parent of 'o_mail_snippet_general' closes odoo/odoo#42513 X-original-commit: 751dd4c16f8e6c9e373bd9be3a783cde2833947d Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>