You'd need to have an image field that a user can upload a background image to. Then you'd need to write custom CSS to absolute position it and stretch it to fill the entire profile div. The profile div would need to be relative so it won't go outside of the profile display.
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The above is just an example. If you supplied it an image URL it'd stretch the image to fill the entire profile div. I recommend adding custom CSS to your Joomla template CSS file as it changes less often and less likely to lose your changes on updates.
For further CSS usage please see the below tutorials.
Kyle (Krileon) Community Builder Team Member Before posting on forums:
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-- If you are a Professional, Developer, or CB Paid Subscriptions subscriber and have a support issue please always post in your respective support forums for best results!
-- If I've missed your support post with a delay of 3 days or greater and are a Professional, Developer, or CBSubs subscriber please
send me a private message
with your thread and will reply when possible!
-- Please note I am available Monday - Friday from 8:00 AM CST to 4:00 PM CST. I am away on weekends (Saturday and Sunday) and if I've missed your post on or before a weekend after business hours please wait for the next following business day (Monday) and will get to your issue as soon as possible, thank you.
-- My role here is to provide guidance and assistance. I cannot provide custom code for each custom requirement. Please do not inquire me about custom development.