CSS for Clicked Button in Nested List

[mobile207]

What is the css class for selected (clicked) list items in a nested list? The following doesn't seem to do it:

.x-item-selected{
background-color:#f2f2f2;
}


SASS looks great but I do not have access to ROR/ Ruby and the project is almost done. Just need to know how to style the nested lists with CSS overrides..

Thanks