In the article "New! JSON themes in Kopano WebApp" by the 16.07.2018 Martjin Alberts wrote about the possibility to make your own themes. When I read the instructions I thought cool but how should it go really?
I don't write again what he wrote's, I will only describe the steps which you will to change to your own themee
The theme-call you make in
When you had restarted your WebServer and call your Kopano WebApp Site you should see your changes
So you have your own Company or Club-Design which you want