More accurate centered play section

[FANMixco]

With the new long screen devices, the play section is not very centered friendly. Right now, the play section has a workaround with a CSS class called .longPhonePortrait it's called in the last section of timer.js.

The main logic behind this trick is: "it calculates if the width is less than the double of the height." If it's then it applies the .longPhonePortrait.

Another option would be to provide the precise height to innerPlayContainer that subtract the footer and upper components height. If this is done, then you could try centering this div in the right location.

For now, the current workaround is good enough.