html,
body {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
}
.site-wrap {
  position: absolute;
  top: 0;
  right: 0;
  left: 0;
  margin-top: 0 !important;
  bottom: 0;
}
main {
  position: absolute;
  top: 0;
  right: 0;
  left: 0;
  margin-top: 0 !important;
  bottom: 0;
}