rohanperry on "Using border-radius for dropdown menu in corporate theme"

I finally got it.

#nav li li a, #nav li li a:link, #nav li li a:visited {
background: #0b55a1;
color: #fff;
display: block;
width: 158px;
font-size: 12px;
margin: 0;
padding: 7px 14px 7px 14px;
border-top: 1px solid #0b55a1;
border-left: 1px solid #0b55a1;
border-right: 1px solid #0b55a1;
border-bottom: 4px solid #0b55a1;
position: relative;
}

#nav li ul {
z-index: 9999;
position: absolute;
display: block;
left: -999em;
height: auto;
width: 180px;
margin: 0 0 0 0px;
padding: 0px;
border-right: 1px solid #0b55a1;
border-top: 1px solid #0b55a1;
border-bottom: 4px solid #0b55a1;
border-bottom-left-radius: 6px;
border-bottom-right-radius: 6px;
overflow: hidden;
-webkit-box-shadow:rgba(0, 0, 0, 0.298039) 0 0 6px;
}