How to control a background image on an iPad

After a lot of nagging from my artist daughter, I picked up an ipad (9.7") and really like it but am experiencing difficulty building webpages that respond properly to its screen size. Here is a capture of what I’m trying to do:

What am I doing wrong that I cannot get a ‘proper’ display on my iPad’s Firefox or on Safari while it looks perfect in the Puffin browser? Anyone experience something similar & how did you fix the issue? Do I need to include some -WebKit extensions in my CSS to get FireFox to properly display on my iPad?

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