html, body {
  height:100%;
}
body {
  margin:0;
  padding:0;
  text-align: center;
}
#logo {
  margin: 0;
  position: absolute;
  top: 50%;
  left: 50%;
  -ms-transform: translate(-50%, -50%);
  transform: translate(-50%, -50%);
}
#logo img {
  height:200px;
}