pre {
	background: blue;
	width: 500px;
}

#relativePos {
	position: relative;
	top: 200px;
    background: red;
}

#absolutePos {
	position: absolute;
	top: 0px;
    background: green;
	width: 200px;
}

#anotherPos {
	position: relative;
	top: 20px;
}