As I am a beginner, I didn't create a child theme so I made the mistake to make the upgrade and all my changes disappeared.
My website is : http://www.gsa-travel.fr
I found last time a way to reduce the width of the pages so they look less stretched as they are right now. Like 70% as it is right now wedged with more background on the sides. Can someone tell me where I have to change it in editor with the style.css or in the "custom CSS"?
I also have the same problem as many with the header image, but I'll check the other threads, the answer must be somewhere.
Thanks a lot in advance. I don't know anything about CSS