body {
  position: relative;
  margin: 0
}

.centered {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
}

#logo {
  position: absolute;
  bottom: 0;
  left: 0;
}

#logo a {
  display: block;
}