bottom

Values

<length> | <percentage> | <auto>

All positioned elements (elements that don't have position: static;)

Bottom defines the distance between the bottom of an element and the bottom of its surrounding block.

body .box{
position:fixed; bottom: 10px;
}
div#border{
position:absolute; bottom: 0;
}

Chrome	Firefox	Internet Explorer	Opera	Safari
1.0+	1.0+	5.0+	6.0+	1.0+