I as noticing that the modal mask for cfwindow was rather minor. Also, I wanted to change its color to match the theme of the site I was working on. So, using my buddy firebug, I was able to get the class used for the mask.

view plain print about
1.x-dlg-mask{
2    background-color: #000000;
3    opacity:0.50;
4}

I was then able to use it to change the color and opacity of the overlay. Just put this code before the cfwindow tag or in your site's css file.

--Dave