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Depending on the image you have used, you should see something similar to the screenshot below:
Now, the background image fills the entire background area of the page. If you try scrolling down
the page, you will see that the background stays put, while the page content moves down the page.
So, our site background looks a little better now but can you see how the top-right portion of the
background looks as if it came from a separate image?
You can solve this problem in two ways – either use a very large background image and accept that
this will make your site load more slowly – especially for new visitors, or use a background image
with a repeating pattern.
There are websites like http://repeatxrepeaty.com/ which offer ready-made repeating images
which you are free to use on your own site.
Date: 13/10/14
Filename: Wordpress-4.0_user_guide.docx
Created By: Interconnect IT Ltd 2014
Version: 4.0
Page 85