#back-to-top {
  position: fixed;
  bottom: 40px;
  right: 30px;
  z-index: 9999;
  width: 52px;
  height: 32px;
  /*font-size: 16px;*/
  font-weight: 700;
  text-align: center;
  line-height: 30px;
  background: #ffffff;
  color: #444;
  cursor: pointer;
  border: 0;
  border-radius: 2px;
  text-decoration: none;
  transition: opacity 0.2s ease-out;
  opacity: 0;
}

#back-to-top:hover {
  background: #74c4ed;
  color: #fff;
}

#back-to-top.show {
  opacity: 1;
}

#back-to-top.fixed {
  position: relative;
  float: right;
}