I have an image with a set "canvas" size of 400x400. I want to zoom in and out on this image with a slider or zoom in/out buttons but keep the canvas dimensions. I've found many examples, but they resize the image (eg 500x500) or have a hover box, etc... etc... I need to keep that 400x400 and "magnify" it. Zooming in on the center is fine, just can't figure out how to pull it off.