@charset "utf-8"; 
#back-to-top {
  display: inline-block;
  background-color: transparent !important;
  width: 38px;
  height: 112px;
  text-align: center;
  border-radius: 4px;
  position: fixed;
  bottom: 18px !important;
  right: 60px !important;
  transition: background-color .3s, 
    opacity .5s, visibility .5s;
  opacity: 0;
  visibility: visible;
  z-index: 99999999;
}
.show {
  opacity: 1 !important;
  visibility: visible !important;
}