.back-to-top-btn {
  height: 52px;
  position: fixed;
  bottom: 46px;
  right: 100px;
  z-index: 2;
  cursor: pointer;
  display: none;
}

.activeBtn {
  display: block !important;
}

@media only screen and (min-device-width: 375px) and (max-device-width: 480px) and (-webkit-min-device-pixel-ratio: 2) {
  .back-to-top-btn {
    height: 32px;
    width: 32px;
    bottom: 113px;
    right: 24px;
  }
}

@media only screen and (min-device-width: 768px) and (max-device-width: 1024px) and (-webkit-min-device-pixel-ratio: 1) {
  .back-to-top-btn {
    height: 32px;
    bottom: 130px;
    right: 72px;
  }
}