body {
  width: 100%;
  height: 100%;
}
.scale-container {
  display: none;
  position: fixed;
  left: 0px;
  top: 0px;
  width: 100%;
  height: 100%;
  background-color: #000;
  z-index: 999;
}
.scale-container img {
  width: 100%;
  position: fixed;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
}