body {	background-color:#008; }
main{	background: #005; }
.grupos{ float:left; width: 290px; }
nav{	background: #005; }
ul#dropdownmenu li {
	background: -moz-radial-gradient(60% 55%, circle closest-corner, #005, #335 20%, #005);
	background: -ms-radial-gradient(60% 55%, circle closest-corner, #005, #335 20%, #005);
	background: -webkit-radial-gradient(60% 55%, circle closest-corner, #005, #335 20%, #005);
}
ul#dropdownmenu li:hover ul li { background:#09C; }