How to contain a pattern in other shapes (aka creating something like a border)
I'm fairly new to designer and i'm breaking my head over this.
I want to create something similar to here:

And i've created a few tile generators that do their job with the color tiles perfectly, but i can't find a way to contain the tile generator patterns in a border shape kinda? Is there a smart way to create a shape/border around the tiles? So far my cube looks like this, without any white border and without the grey border at all because if i add a mask, it cuts the tiles on the edges in half

Maybe i'm entirely missing a point in how to control patterns in designer? Any tip or help is appreciated
Thank you!

