What would be the correct CSS code to use to have the text color of the main root menu change when the menu is moused over and while hovering over the sub-items?

Right now I'm using this to set the color to white:

.RadMenu a.rmLink
{
    cursor: default;
    display: block;
    text-decoration: none;
    font-family: Arial, Helvetica, sans-serif;
    font-size: 12px;
    color: #ffffff;
    
}

and I want the color to change to black (#000000) while that menu is open. Thanks!

Got it working...

.RadMenu a.rmExpanded
{
    color: #000000 !important;
}