Notification Font Size and SKU Display

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I am attempting to make our "Draft Order Invoice" as compact as possible, so we can print it out on less pages. Is there any way to adjust the code so the font size of the titles and price is smaller? I would also like the option to display the SKU of products if they do not have a variant, currently I added the code below to display the SKU's. However, it doesn't display for products with no variants.

({{ line.sku }})

  Here is a screenshot of the current preview as well.