css

body {
	background-color: black;
}

#divRosso{
	background-color: red; border:2px solid purple; width: 10px; height: 100px;
}

#divVerde {
	background-color: green; border:2px solid purple; width: 10px; height: 100px;
}

#divBlue {
	background-color: blue; border:2px solid purple; width: 10px; height: 100px;
}

/* getComputedStyle() */