Use the links below to re-style this entire web site to see how you can change the looks of a website with CSS while leaving the content in tact.
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I'm generally against putting text on an image but if you really, really, really, really, really, really, really, really, really, really, really, really, really, really, really, really, really, really, really, really, really, really, really, really want to do it, here's your example, really. Make sure you use the drop shadow to make the text more legible. Also note, that in my example, even though the text on the image meets accessibility standards, it's still difficult to read. That's why I don't like putting text on top of an image.
One advantage of putting text on an image this way (instead of making it part of the image) is that you can search for the text. For example, search for "Centered" and you'll see it highlighted. If the text was part of the image, that wouldn't work. But still, don't do it if you can avoid it.