* {
  margin: 0;
}
html, body {
  height: 100%;
}
.page-wrap {
  min-height: 100%;
  /* equal to footer height */
  margin-bottom: -132px; 
}
.page-wrap:after {
  content: "";
  display: block;
}
.site-footer, .page-wrap:after {
  height: 132px; 
}
.site-footer {
width: 900px;
  background: #ffffff;
  margin: 0 auto;
}