#back-top {
  position: fixed;
  bottom: 10px;
  margin-left: 20px;
  z-index:9990;
  right: 40px;
  display: block;

  -webkit-transition: all 0.5s ease-out;
  -moz-transition: all 0.5s ease-out;
  -ms-transition: all 0.5s ease-out;
  -o-transition: all 0.5s ease-out;
  transition: all 0.5s ease-out;

  -webkit-transition-property: right, transform, opacity;
  -moz-transition-property: right, transform, opacity;
  -ms-transition-property: right, transform, opacity;
  -o-transition-property: right, transform, opacity;
  transition-property: right, transform, opacity;

  -moz-transform: rotate(0deg); /* Для Firefox */
  -ms-transform: rotate(0deg); /* Для IE */
  -webkit-transform: rotate(0deg); /* Для Safari, Chrome, iOS */
  -o-transform: rotate(0deg); /* Для Opera */
  transform: rotate(0deg);

}

#back-top .icon {
  width: 50px;
  height: 50px;
  display: block;
  margin-bottom: 7px;
  -ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=50)";
  filter: alpha(opacity=50);
  -moz-opacity: 0.5;
  -khtml-opacity: 0.5;
  opacity: 0.5;
  background: #ccc url(up-arrow.png) no-repeat center center;
  -webkit-border-radius: 8px;
  -moz-border-radius: 8px;
  border-radius: 8px;
}

#back-top .icon:hover {
  -ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=80)";
  filter: alpha(opacity=80);
  -moz-opacity: 0.8;
  -khtml-opacity: 0.8;
  opacity: 0.8;
}

#back-top.back-top-hide {
  right: -60px;
}
#back-top.hide {
  -ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=0)";
  filter: alpha(opacity=0);
  -moz-opacity: 0;
  -khtml-opacity: 0;
  opacity: 0;
  pointer-events:none;
}


#back-top.rotate{
  -moz-transform: rotate(180deg); /* Для Firefox */
  -ms-transform: rotate(180deg); /* Для IE */
  -webkit-transform: rotate(180deg); /* Для Safari, Chrome, iOS */
  -o-transform: rotate(180deg); /* Для Opera */
  transform: rotate(180deg);
}