Trying to add full page background image

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Hello,

I have some basic knowledge of how to do some editing. Where would I put the code to a background image for sitewide full background image? And what would that code look like? I have 5.7.5.2 editing the Elemental theme. Is it better to define somewhere HTML or edit CSS file? And where? Thanks for any help, oh and is there info needed to tile a small pic or will it stretch pic to fit entire site background? Thanks again.

 
PineCreativeLabs replied on at Permalink Best Answer Reply
PineCreativeLabs
anonku replied on at Permalink Reply
Thanks, that helped a lot!!