Transparent footer/socket

Hi There,

Great theme…

I’m looking and looking, and everthing I try doesn’t work.
Ik want to make the footer en socket transparent, so only my transparent png shows.
Please take a look at: http://www.amarafoundation.org/wp/
And then you see the footer en socket are white.

I used several css tricks, one of them is:
.footer_color .widget_nav_menu ul:first-child>.current-menu-item, .footer_color .widget_nav_menu ul:first-child>.current_page_item {
background: transparent!important;
box-shadow: none!important;
}

But nothing seems to work.
What am I doing wrong?

Best Regards,
Annelies