On Mon, Jul 29, 2019 at 12:00:07PM -0400, pharo-users-requ...@lists.pharo.org
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You're using the Bootstrap 4 library and methods.
I don't know about the one referenced in the MOOC, but there are
several differences between Torsten's Bootstrap 3 (TBS prefixed
classes) and Bootstrap 4 (SBS prefix), in particular because Bootstrap
4 library wrapper uses a subclass of WAHtmlCanva
