How to add Templates with the web interface ?

[soleneadv]

I try to add templates to my switches with the option in the web interface of netbox, and i tried pretty much everything in the grid template area field :

.deviceview.area {
grid-template-areas:
"x x x x x x x x x x x x x x gigabitethernet0-1 gigabitethernet0-3 gigabitethernet0-5 gigabitethernet0-7 gigabitethernet0-9 gigabitethernet0-11 s0 gigabitethernet0-13 gigabitethernet0-15 gigabitethernet0-17 gigabitethernet0-19 gigabitethernet0-21 gigabitethernet0-23 z z z z z"
"x x x x x x x x x x x x x x gigabitethernet0-2 gigabitethernet0-4 gigabitethernet0-6 gigabitethernet0-8 gigabitethernet0-10 gigabitethernet0-12 s0 gigabitethernet0-14 gigabitethernet0-16 gigabitethernet0-18 gigabitethernet0-20 gigabitethernet0-22 gigabitethernet0-24 z z z z z";
}

then just

"x x x x x x x x x x x x x x gigabitethernet0-1 gigabitethernet0-3 gigabitethernet0-5 gigabitethernet0-7 gigabitethernet0-9 gigabitethernet0-11 s0 gigabitethernet0-13 gigabitethernet0-15 gigabitethernet0-17 gigabitethernet0-19 gigabitethernet0-21 gigabitethernet0-23 z z z z z"
"x x x x x x x x x x x x x x gigabitethernet0-2 gigabitethernet0-4 gigabitethernet0-6 gigabitethernet0-8 gigabitethernet0-10 gigabitethernet0-12 s0 gigabitethernet0-14 gigabitethernet0-16 gigabitethernet0-18 gigabitethernet0-20 gigabitethernet0-22 gigabitethernet0-24 z z z z z

and then just "x x x x x x x"

or [ x x x x ]

I get these error messages :

How to do that properly ?

Thank you