ul#principal {
	border: 1px solid red;
	width: 200px;
	background-color: #aaaaaa;
}
ul#principal li {
		color: red;
}
ul#principal li  a {
	color: black;
}
ul#principal li.on {
	background-color: red;
	color: white;
}
ul#principal li.on  a {
	color: #ffaaaa;
}