Funny to see this link here, just after I saw this site yesterday. I was forced to google how to disable custom scrollbars when I was reading the "A simple hash table in C" link from 2 days ago [1]. The site set the scrollbar width to 4 pixels which was so narrow I could just see it but couldn't grab it with mouse anymore. Totally unusable.

[1] https://news.ycombinator.com/item?id=36302552