how to set div in bottom of page code example

Example 1: keep div at the bottom of page

#footer {
    position: fixed;
    bottom: 0;
    width: 100%;
}

Example 2: css div at bottom of div

/* Position inside div at the bottom of containing (outside) div */

<style>
.outside {
	position: relative;
    width: 200px;
    height: 200px;
    background-color: #EEE; /*to make it visible*/
}
.inside {
    position: absolute;
    bottom: 2px;
}
</style>
<div class="outside">
    <div class="inside">inside</div>
</div>

Example 3: Make div bottom page

#container {
    position: relative;
}
#copyright {
    position: absolute;
    bottom: 0;
}
or 
#copyright {
    position: absolute;
    bottom: 2rem;
}