/********************************
         Back to top
********************************/
.back-to-top {
  position: fixed;
  bottom: -20px;
  right: -24px;
  z-index: 9999;
  opacity: 1;
  cursor: pointer;
}
.back-to-top img {
  width: 100px;
}
.back-to-top.show {
  bottom: 0% !important;
  -webkit-transition: 1s;
  -moz-transition: 1s;
  transition: 1s;
}
.back-to-top.back-run {
  bottom: 100% !important;
  -webkit-transition: 1s;
  -moz-transition: 1s;
  transition: 1s;
}
.back-to-top.back-down {
  -webkit-transition: 1s;
  -ms-transition: 1s;
  -o-transition: 1s;
  -moz-transition: 1s;
  transition: 1s;
}