Fit an overlay canvas to the same position in all resolutions

Hello all! This is not too important at the moment as I’m only just starting my new game, but I want to get it out the way to be honest…
I may not be explaining it very well but how could I get an overlay canvas to fit to the same position in all resolutions?
So far on the canvas I have two buttons that need to always appear in the top-left corner. This image shows a 16:9 ratio which is where the buttons should be.

Then here’s the 16:10 ratio. Half the damn button gets cut-off here! And then beneath that is the Standalone resolution, where the buttons… well… the image explains it all.

I appreciate any help!

It seems to me that you are having the same problem that I had Im not sure if this will fix your problem but try this