Fix video PlayButton styles

[breadadams]

Closes #102

[Kikobeats]

I don't understand why so style changes, it adds a lot of noise in the PR

I suppose the important part is here:
https://github.com/microlinkhq/sdk/pull/104/files#diff-216ce2c206559df42ce87fd0f9ec661eR23

My question is: why this change is necessary? in the storybook play button looks as expected 🤔

[breadadams]

Crap, my prettier kicked in 🤦‍♂️. There are only 3 actual style changes @Kikobeats.

1. left positioning on play button pseudo elements.
2. top positioning on play button pseudo elements.
3. backface-visibility on all parts of play button for antialiasing.

As for the reason why, I wish I could say... I haven't been able to fathom that yet.

I understand why it's breaking - because the lack of top/left positioning on the pseudo elements is make them default to a standard position. However I haven't yet worked out why it was working for us before on the Storybook 🤷‍♂️

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Actually, after some zooming in on the Storybook, I'm seeing this:

So it wasn't perfect 🙂, it is now:

[Kikobeats]

awesome 🎉