css bottom:0 isnt the bottom of the page code example

Example: css bottom:0 isnt the bottom of the page

/* You need to add position: relative; to the parent container, which in this case is .wrapper. */

<div class = "wrapper">
	<div class = "bottom"><div>
</div>

.wrapper {
	position:relative;
}

.bottom {
    position:absolute;
}