Application Form is broken on Safari 6.0.5 on OS X 10.8.4. It doesn't display anything after "What tools do you like?" Error Console shows "Failed to load reso

Application Form is broken on Safari 6.0.5 on OS X 10.8.4. It doesn't display anything after "What tools do you like?" Error Console shows "Failed to load resource: the server responded with a status of 404 (Not Found) https://news.ycombinator.com/sus.css" https://news.ycombinator.com/sus.css"