Tutorial animation on Live Demo page doesn't play (Mac/Safari)

Steps to reproduce

Visit dynalist.io as potential user, visit live page, click tutorial.

Expected result

Tutorial animation demonstrates features.

Actual result

I see the animation but it doesn’t ‘play’ (remains on first frame).

Environment

Mac OS High Sierra. Safari.


Additional comments

Perhaps missed opportunity for capturing interest of new user. I switched to chrome and it was fine.