Safe mode came on and cannot use the tutorial until it is deemed safe.
I am having issues with viewing the page at all. I was wondering if it was just my computer or everyone’s? This is what the page current looks like for me:
Trying to scroll down only shows the rest of the background style of the webpage, but no words or text.
I’m seeing the same thing- looked fine yesterday, but now the tutorials are all formatted oddly and missing the videos. They’re still watchable on Youtube if you go searching through the official Unity account though.
It may be a browser issue, I know I’m not having any trouble with the tutorials.
Hope it gets fixed for you soon 
Give the page another go? Should be fine.