[Renate]

The Poke3 loses a couple of pixels on the edges.
You can see them if you look at an angle, but not straight on.

You need root for most of what you're doing.
You're also mixing up a bunch of stuff.
dd is for copying disk partitions (among other things)
properties are set using "setprop" (like qemu.hw.mainkeys)
settings are set using "settings"

Changing parts of /system might make updates in the future not work correctly.
Right now (I think) the Onyx updates are not really incremental.
But they could be later.

Does your browser have a default style sheet? That's where I'd start.