How can I add CSS to a user notification item when the standard template option is checked?

Did you solve it in the meanwhile? Basically you specify a custom version of this file: ..\Innovator\Client\xml\notification_popup_template.xml

Please note that this is a multilingual component!

Did you solve it in the meanwhile? Basically you specify a custom version of this file: ..\Innovator\Client\xml\notification_popup_template.xml

Please note that this is a multilingual component!

Thanks, Angela, for your answer. I actually used an HTML template to achieve the desired result.