If you go back to the lesson, with the correct code in place, re-size the window on the right by dragging the divider bar to the left and right on the canvas. Once you hit the 350px width threshold the image should change in size and color.
I sat there for a good 5 minutes trying to figure out why nothing was happening, I didn’t even think to do that even though it literally hints to that in the explanation. Thank you.