how do you make scale the size of offset? like 100x100 relatively on each screen?

like the title says so,

I used scale often because it sets the size relative to all devices.

but in this case, I want a square image 100x100, and of course, using offset will mess it up on each device screen, so how do I achieve this? so I want the offset size relatively to all devices, if possible.

If I don't do that, then for a bigger device, it will be small to see.

in other words just in case you need two perspectives to understand,

also, how do you set an image scale to offset so that its size is relative to all devices like for example, 100x100 will be bigger on other devices but will maintain the look of the square shape. If this is not achieved, then I won't be able to let the big devices look nicely of the image.