Centering in the ‘unknown’ Firefox bug – need help (codepen included)

[HenryDurdan]

Hi guys,

Using Chris’ method of centering in the unknown I have encountered a bug within Firefox.

Chris’ tutorial: https://css-tricks.com/centering-in-the-unknown/

Simple codepen I made illustrating my issue: http://codepen.io/henrydurdan/pen/cHfmb

Can anyone see why this is doing that?

Any help would be greatly appreciated!

Thanks,

Henry.

[Author]

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