#back-to-top-button.button {
  padding: 0;
  margin: 0;
  position: fixed;
  bottom: 25px;
  right: 25px;
  width: 50px;
  height: 50px;
  font-size: 40px;
  line-height: 55px;
  transition: none;
  cursor: pointer;
  display: none;
}

body.admin-menu #back-to-top-button.button {
  bottom: 85px;
}