Auto resizing a fixed background image?

I have a fairly large image I'd like to use as a static background. I finally found some CSS code that will keep it static but its only showing the top half of the image. Is this a matter of resizing the image or can I get the theme to auto-resize it? I'm worried that just resizing the image will only make it look good on my monitor. This is the custom CSS I have so far:

body {
background-size: 100%;
background-position: top center;
background-attachment: fixed;
}

The background-size: 100% doesn't seem to do anything. Nothing changed when i stuck it in there. What am I missing here?

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