It’s also not just this challenge, the height lesson is broken in the same way.
The moderators had me enter diagnostic queries into the console for the height lesson page at different zoom levels, thinking this might be the issue (i was using 67%, the error also occurs for me at smaller zooms, but does not occur for me at levels 75, 90, and 100).
though it seems it should work at any zoom level. (what level zoom were you using? does using 75, 90, or 100 get you around the error?)
for some reason the same error does not occur in firefox, which I used to run tests in these two lessons in order to complete the applied visual design curriculum. (this was before they had me testing zoom levels in Chrome; the error apparently does not occur in Firefox at any zoom level.)