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html { background: [img[/home/steve/Desktop/Reid/zzz.jpg]] fixed; position: absolute; background-size: cover; z-index: 1; width:100%; height:100%; top:0; left:0; }
Comments
Based on the URL you used in your example I am going to assume you have created a Reid directory/folder on your desktop to store your image files into, I am also assuming that that is the same directory/folder you plan to save the Story HTML file created via the Publish to File option into.
If the above assumptions are correct then you can change your image URL to a relative one like so:
Unfortunately the Test and Play options don't support viewing images via relative URLs but if you use the Publish to File option to create/save your Story HTML into the Reid directory/folder and the image will appear when you view that HTML file within a web-browser.