Resizing GUI position with screen size?

I am trying to make a Piano tiles game but when resizing my screen I run into a problem. The GUI position is not snapping to the top of the Canvas. The first picture included is what happens when I resize my screen. The second image shows what I want to happen when I resize the screen. Any help is greatly appreciated! Comment if you need clarification. What I want to happen: Also my anchor points for the group of tiles, that I want to snap to the top of the canvas, are the same as the first pictures anchor points.