.blackContainer {
	width: 300px; height: 50px;
	margin: 2px auto;
	background-color: black;
}

.rafDiv {
	width: 50px; height: 50px;
}

#red_div {
	background-color: red;
}

#green_div {
	background-color: green;
}

#blue_div {
	background-color: blue;
}