images

so I got the module working...In the css i can get a back ground color that just show around the text....no padding or anything......
What I would like to do make it a background image (green.png, blue.png)

but when I insert
.greenblock {
background-image: url(images/all/green.png);
}

nothing shows up. I know the css file is being read because if I change it to background-color it works.

what am I doing wrong?

Thanks for your help!