.back-to-top {
  position: fixed;
  bottom: 25px;
  right: 20px;
  display: none;
  color: #fff;
  background: #fda515;
  padding: 3px 9px;
  border-radius: 50%;
  cursor: pointer;
  z-index: 1000;
  border: .2rem solid #ededed;
  width: 40px;
  height: 40px;
}
 
.back-to-top:hover {
  background: #ff9625;
  color: #fff;
  text-decoration: none;
}