body {
}

.top-buffer {
  margin-top: 20px;
}

.back-to-top {
  position: fixed;
  bottom: 25px;
  right: 25px;
  display: none;
}

#btn-back-to-top {
  display: none;
}

#btn-go-to-bottom {
  display: none;
}

#btn-up-down {
  position: fixed;
  bottom: 20px;
  right: 20px;
  display: block;
}