A5 address labels

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Hi all, I'm a new shopify user and trying to go live this Wednesday! 


We are local delivering and need the packing slip customised to fit to A6 labels.  I found this code, but when run through a normal printer it fills the whole page. 




Does anyone know what I need to change in the code to make the template always 200 high x 140 wide

Many thanks in advance for any help