.viewer-download-btn {
  position: absolute;
  top: 12px;
  right: 56px;
  z-index: 9999;
  border: 1px solid rgba(255, 255, 255, 0.45);
  background: rgba(0, 0, 0, 0.45);
  color: #fff;
  font-size: 13px;
  line-height: 1;
  padding: 8px 10px;
  border-radius: 6px;
  cursor: pointer;
  user-select: none;
}

.viewer-download-btn:hover {
  background: rgba(0, 0, 0, 0.6);
}

@media (max-width: 639.98px) {
  .viewer-download-btn {
    top: 10px;
    right: 52px;
    padding: 7px 9px;
    font-size: 12px;
  }
}