Wrapper issue / Cube CSS attempt

Good morning (UK time), I am having issues with my wrapper class after trying to refactor to CUBE CSS.
Frustratingly doesn't seem to be working when applying a max-width through the 'data-type' method, although works absolutely fine if I apply it directly to my wrapper class.

Any help would be much appreciated - I am sure it is something blatant that I just cant see at the moment.

Thanks in advance.
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