@charset "utf-8";
#js-pagetop {
  position: fixed;
  width: 70px;
  height: 70px;
  border-top-left-radius: 8px;
  background: #666;
  color: #fff;
  right: 0;
  bottom: 0;
  cursor: pointer;
  transition: opacity .6s ease;
}
 
#js-pagetop span {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  display: block;
  width: 100%;
  text-align: center;
  font-size: 30px;
}

#js-pagetop:hover {
    opacity: .8;
}