How to add padding to the first and last menuitems

Hi,
I have asp.net menu in image below. I use
.dynamicMenuItemStyle {
    background-color:#62CDF3;
    color:#202020;
    z-index:200;
    position:relative;
    margin-left:11px;
    padding-top:2px;
    padding-bottom:2px;
    padding-left:10px;
    padding-right:10px;
    font-family: Arial,Helvetica,Verdana,sans-serif;
    font-style:normal;
    font-weight:normal;
    font-size: 12px; 
    text-decoration: none;
}
I want to increase the padding top for first element (Overview) and padding bottom for last element (Compare to room lab). But if I change the padding-top and padding-bottom in dynamicMenuItemStyle, the line gaps among menuitems also increase correp ...