html, body {
  height: 100%;
  width: 100%;
  padding: 0;
  margin: 0;
}
#background-wimex{
  z-index: -999;
  min-height: 100%;
  min-width: 100%;
  width: 100%;
  height: 100%;
  position: fixed;
  top: 0;
  left: 0;
}