html, body
{
height: 100%;
}

#wrapper
{
min-height: 100%;
height: auto !important;
height: 100%;
margin: 0 auto -100px auto; /* the bottom margin is the negative value of the footer's height */
}

#footer,
#push
{
height: 100px; /* .push must be the same height as .footer */
clear: both;}