.xaver-logo {
  margin: auto;
  display: block;
  width: 100px;
  height: 25px;
  background: url("/xaver-mini.png") no-repeat;
  -webkit-transition: all 0.2s ease-in-out;
  transition: all 0.2s ease-in-out;
}

.xaver-logo.xaver-hover:hover {
  background-position: bottom;
}