.top_btn {
  position: fixed;
  right: -150px;
  bottom: 45%;
  height: 50px;
  width: 50px;
  background: transparent !important;
  border: none !important;
  z-index: 9999;
  opacity: 0;
  visibility: hidden;
  transition: all 0.2s ease-in-out;
  cursor: pointer;
}
.top_btn-show {
   right: 0;
   opacity: 1;
   visibility: visible;
   transform: translate(-35px);
 }
.top_btn-svg circle {
  fill: #fff;
  stroke: #959595;
  -webkit-transition: .2s ease-in-out;
  -o-transition: .2s ease-in-out;
  transition: .2s ease-in-out;
}
.top_btn-svg rect {
  fill: #959595;
  -webkit-transition: .2s ease-in-out;
  -o-transition: .2s ease-in-out;
  transition: .2s ease-in-out;
}
.top_btn:hover .top_btn-svg circle {
  fill: #e12718;
  stroke: #e12718;
}
.top_btn:hover .top_btn-svg rect {
  fill: #ffffff;
}
.top_btn:hover .top_btn-svg circle {
  fill: #e12718;
  stroke: #e12718;
}
.top_btn:hover .top_btn-svg rect {
  fill: #ffffff;
}