html, body {
  width: 100%;
  height: 100%;
  margin-top: 0px;
  padding-top: 0px;
  top: 0px;
  margin-left: 0px;
  padding-left: 0px;
  left: 0px;
}
body {
  overflow: hidden;
}
#bg {
  width: 100%;
  height: 100%;
  display: block;
  position: absolute;
  z-index: 1;
}
#flash {
  display: block;
  position: relative;
  z-index: 5;
  margin-right: auto;
  margin-left: auto;
}