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CSS CSS - Beyond the Basics Understanding CSS Transitions and Transforms 3D Transforms Review

Rendering problems with 3d

Hello, In order to solidify the knowledge gained during first two stages of this course I decided to build some simple 3d animation on codepen. I've included autoprefixer in my pen and started building it in Chrome. Everything went well, until I decided to sample the final animation in Safari. There seems to be a glitch and I cannot get, whether it is a browser' or my fault?

Here is the pen

P/S: A friend of mine opened this animation on his MBP 15 2012 with a dedicated GPU in Safari and it lagged, while mine MBPr 15 with Iris rendered it in Chrome very well and smooth. What might be the problem?

I appreciate any feedback and thank you all in advance!