#scroll-to-top {
  position: fixed;
  bottom: -45px;
  right: 15px;
  width: 40px;
  height: 40px;
  text-align: center;
  line-height: 45px;
  background: #212121;
  color: #ffffff;
  display: block;
  z-index: 29999;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
  border: 0;
  transition: all .3s;

  &.active {
    bottom: 40px;
  }

  i {
    font-size: 25px;
  }

  &:hover {
    background-color: $color__blue;
  }
}
<b>x<br><br>Windows NT KPTV 6.2 build 9200 (Windows Server 2012 Datacenter Edition) i586<br></b>