[RESOLVED] Css text change colour on hover not working.

HTML Code:

---

nav li a
{
        display:block;
        text-decoration:none;
        color:#fff;
}
nav ul
{
        list-style: none;
        margin: 0px;
        padding: 0px;
}       
nav li
{
        padding: 5px 20px;
        text-align:center;
        float:left;
        background-color:#000;
        position:relative;
}       
nav li:hover{background-color:#fff; color:#000;}
                                       
nav li ul li
{
        float:none;
}
nav li ul
{
        position:absolute;
}

---

I've tryed doing
nav a:hover {color:#000;}

which works but only for when text is hovered, i want it to do it when the whole box is hovered over.