#back-top a, #back-top span {
  width: 53px;
  height: 43px;
  display: block
}

#back-top {
  position: fixed;
  bottom: 7px;
  right: 4%;
    z-index: 101;
}

#back-top a {
  background: url(../../img/9th/back.png) no-repeat
}

#back-top a:hover {
  background-position: 0 bottom
}

#back-top span {
  margin-bottom: 7px;
  left: auto;
  margin-right: auto
}