#back-to-top {
  position: fixed;
  bottom: 50%;
  right: 40px;
  z-index: 999;
  width: 47px;
  height: 60px;
  text-align: center;
  color: #606f89;
  cursor: pointer;
  border: 0;
  background-image: url('http://comet.noonspace.com/w61NoonSpace/home2025/MsgInfo/Top_icon.png');
  background-position: center;
  background-repeat: no-repeat;
}

#back-to-top.show {
  opacity: 1;
}

#back-to-top.TopRight {
  top: 40px;
  right: 40px;
}

#back-to-top.CenterRight {
  bottom: 50%;
  right: 40px;
}

#back-to-top.BottomRight {
  bottom: 40px;
  right: 40px;
}

#back-to-top.TopLeft {
  top: 40px;
  left: 40px;
}

#back-to-top.CenterLeft {
  bottom: 50%;
  left: 40px;
}

#back-to-top.BottomLeft {
  bottom: 40px;
  left: 40px;
}

@media (max-width: 480px) { 
#back-to-top.BottomRight { display:none; height: 0px; }
}