I am trying to add a backgound color to my menu bar.   The following css accomplishes the desired result.  Is this the best way to handle this?  How can I make the header NOT sticky?

body header#top nav ul li {
position: relative;
top: -55px;
background-color: #;
height: 170px;
}

.sf-menu {
position: relative;
top: 110px;
background-color:#9f9;
color:#0f0f0f;
height:3em;
}

.sf-menu a, .sf-menu a:visited {
color: #000;
}

Can I make my header/menu NOT sticky?