Code blocks are not visible in the guide about CRUD Operations

Hello fCC-folks,
I want to read this Code about CRUD-Operations by Zafar Saleem:

But to me it seems like the Code blocks in the text are not visible. Well of course I just could read the source itself, but it would help me to read them in the tutorial, since there is regular reference to code-chunks in the text. I tried it on Firefox and Chromium. With and without Noscript. So I guess its a bug on the site itself. I hope this is the right place to post my question since I did not find any better place.

Thanks in Advance,
mBBq