Specifying a Background Image File
A background image appears behind the text on a page. By default, the image is tiled to fill the page, and scrolls with the page.
Unfortunately, there are plenty of amateurish and awkward examples of backgrounds on the Web. Here are some tips for making yours better than those:
Choose images that are designed to be tiled, so each copy blends smoothly into the next. When the image’s edges blend well, it will look like a single large image. For example, the following image blends well horizontally but has distracting edges vertically.

The edges of the tiled copies of the following image blend together well in both directions. ...
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