Statua Woothemes : CSS issues

Hello everyone!
I’m struggling to set up my new photography portfolio.

http://www.stuedwards.com
I can’t find any helpful documentation regarding css tweaks and mods to this theme anywhere on the net… Maybe it’s one of woothemes forgotten projects…

I’m trying to remove the tiled image behind the slider, and remove the border surrounding the portrait sized images.

I’ve tried adding the below code to custom.css to remove the repeating image and make the background white:

#slides {
background-color:#ffffff !important;
background-image:none !important;
}

.slides_container {
border:0px !important;
background-color:#ffffff !important;
border:0px solid #868988 !important;
}

This changes nothing.
Any tips or help will be massively appreciated!

Thanks very much guys.
Stu