#back-to-top {
  position: fixed;
  bottom: 50%;
  right: 40px;
  z-index: 999;
  width: 55px;
  height: 55px;
  text-align: center;
  color: #606f89;
  cursor: pointer;
  border: 0;
  border-radius: 2px;
  background: rgba(245, 245, 245, 0.8);
  line-height: 55px;
  text-decoration: none;
  font-size: 1.4em;
  border: 2px solid #c8d2e0;
}

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

#back-to-top.TopRight {
  top: 40px;
  right: 40px;
}

#back-to-top.CenterRight {
  top: 50%;
  right: 40px;
  margin-top: -27px;
}

#back-to-top.BottomRight {
  bottom: 40px;
  right: 10px;
}

#back-to-top.TopLeft {
  top: 40px;
  left: 40px;
}

#back-to-top.CenterLeft {
  top: 50%;
  left: 40px;
  margin-top: -27px;
}

#back-to-top.BottomLeft {
  bottom: 40px;
  left: 40px;
}