Transparent Background in Hot Carousel Pro

I'd like to add a transparent background for the Hot Carousel Pro module under options and Article Background. I have joomla 3.1.5. and if i type in transparent, it leaves me with a transparent icon with no color code but as soons as I save it and reopen it flips back to white.
What do I need to establish where to keep the background transparent?
Thanks

Color picker does not allow that, but you can simply add this at bottom of template_css.css:


.carouselarticle {
background:transparent!important;
}

Thanks that worked