How to: overload/ overwrite default CSS for asp:label tag and make it universal in visual studio 2005?

I'm trying to make a universal CSS layout for a large application my companies working on. I ran into a problem while trying to style all asp:label's to look a certain way. I was having the same problem with buttons but I figured that out:

input[type="submit"] { 
    background: red;
}

that will make all the buttons have a red background....

So, does anyone know how to style asp:label's ??? Everything that I've attempted is listed below, but to no avail:

label {
    backgro开发者_StackOverflowund: red; 
}

asp:label {
    background: red; 
}

input[type="label"] {
    background: red; 
}

Since a label just outputs a span, I would imagine that it's like this:

span { background-color:Red; }