Using CSS with Combo or ListBox

Does anybody knows if it is possible to use cascating stylesheets in ComboBoxes or ListBoxes ?

I have a file where i put all my definitions called styles.css , and i have created a definition for listboxes like this

.List
{
Background-color : #ffffff;
border-bottom: #000060 2px solid;
border-top: #000060 2px solid;
border-left: #000060 2px solid;
border-right: #000060 2px solid;
.........
}

but it doesn't work . It works for inputs and textareas , but it doesn't work for combos .

Can anyone help me?

Thanks in advanced

what browser are you working with?

I don't think that will work. I was just searching for a way to make a combo box move to the back of the page so when I right mouse click and get my javascript menu to come up it would be in front of it. it won't though because of the way the box is rendered in the browser.

I'm using I 5.5 .

I can change the font color that way , but how can i change the rest ?

Isn't there any way i can do it ?