When you increase the canvas size, be sure to click in the upper-left corner of the boxes next to Anchor in the Canvas Size options window. This ensures the background you've already created stays in the upper-left corner of the canvas. You'll then need to fill the new part of the background with the existing background color.
After changing the canvas size and filling the new part of the background with the existing background color, you're ready to save the file for Web readability. Be cautious when doing so, as a file this large in height and width can quickly become way too large in file size to use on a web page. I was able to save my diaper pin background as a very low-quality JPEG (10 percent image quality) and get it down to just around 7Kb in file size—not too bad given that the rest of the page this background was intended for is all text. For more tips on saving GIFs and JPEGs, see Chapter 10.
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