body {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
  background-color:#333;
}

.container {
  width: 100%;
  padding-top: 100%;
  overflow: hidden;
  position: relative;
}
 @media screen and (min-width: 769px) {

.container {
  width: 50%;
  padding-top: 50%;
}
}
 @media screen and (min-width: 1140px) {

.container {
  width: 560px;
  padding-top: 560px;
}
}

.image-stage {
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  transition: all 0.1s ease;
  cursor: zoom-in;
  background-color:#fafafa;
}

.image-stage img {
  width: 100%;
  transform: scale(1);
  transition: all 0.3s ease;
  touch-action: pan-y;
  user-select: none;
  -webkit-user-drag: none;
}

.image-stage.zoom-in { cursor: -webkit-grab; }

.image-stage.zoom-in img { transform: scale(3); }

.controls {
  position: absolute;
  right: 2em;
  bottom: 2em;
  z-index: 2;
}

.controls button {
  display: block;
  width: 20px;
  height: 20px;
  padding: 0;
  border: none;
  background-color: transparent;
  cursor: pointer;
  transition: all 0.2s ease;
}

.controls button:focus, .controls button:active { outline: none; }

.control-in {
  opacity: 1;
  margin-bottom: 2em;
}

.control-out { opacity: .4; }

.image-stage.zoom-in + .controls .control-in { opacity: .4; }

.image-stage.zoom-in + .controls .control-out { opacity: 1; }