How set responsive for 10"

HI!
I’m at my first website, I’m using with a lot of satisfaction Cryout Tempera and I have only a litte problem (my background is very very poor):

On standard pc screen: OK
On sartphone: Ok, responsive.
On Tablet 7′: Ok, rsponsive
On Tablet 10′: remain the same as standard pc 15’/17‘. Any solution?

Thanks a lot!