[awwducks]

There's a horizontal scroll bar :)

I'm not sure how to format a block quote without it.

Edit: Well, just added newlines. Seems to look ok.

[DanBC]

Don't use leading spaces, just use >

Or do use leading spaces, but insert line breaks. Remember that people on mobile have very short screens.

[nickpsecurity]

Scrollbars are invisible in my mobile browser until I scroll the box. It just looks like a badly-formatted quote. Something to keep in mind if you're a ddveloper.