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Add background image to about:blank

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I'm on Firefox 57 and did change the background color of my about:blank page by creating a chrome folder inside my profile and added a userContent.css file to that folder containing:

@-moz-document url-prefix(about:blank) {*{background-color:#000000;}}

Now I'm trying to add a background image as well, but whatever I tried didn't work. The image I'm trying to add is also in the chrome folder. Hopefully someone here can point me to the correct css code to add an image as well as the background color.

I'm on Firefox 57 and did change the background color of my about:blank page by creating a chrome folder inside my profile and added a userContent.css file to that folder containing: @-moz-document url-prefix(about:blank) {*{background-color:#000000;}} Now I'm trying to add a background image as well, but whatever I tried didn't work. The image I'm trying to add is also in the chrome folder. Hopefully someone here can point me to the correct css code to add an image as well as the background color.