It was the Glam Theme. Now I’m going to install this one: https://themes.pixelwars.org/theblogger/eric/
But it gave me internal server error when doing something (I don’t know exactly which one), and I’ll try again when I restore the copy of security.
When I installed it, everything was correct except the 4-color bar at the top and bottom.
Can you tell me why, and where to activate it?
Thank you very much in advance