#maomao {
  position: fixed;
  bottom: 40px;
  right: -5px;
  width: 57px;
  height: 70px;
  background-image: url(../image/maomao/maoamo.svg);
  background-position: center;
  background-size: cover;
  background-repeat: no-repeat;
  transition: background 0.3s;
}

#maomao:hover {
  background-position: 60px 50%;
}