Hello there,
I created the ramp differently than how it is shown in the video. For some reason I had to subdivide the face at the top to make the angle 45 degrees (hard to explain, but you can see the additional selected edge in the screenshot)- this is actually a bit confusing because I am fairly certain I followed the initial challenge’s measurements perfectly. I then deleted all the faces of the stairs and used fill to create the ramp and fill the holes in the stairs manually (glad it only has 7 stairs).