.stf__wrapper {
  position: relative;
  width: 100%;
  height: 100%;
  overflow: hidden;
  touch-action: none;
  -webkit-user-select: none;
  -ms-user-select: none;
  user-select: none;
}

.stf__block {
  position: absolute;
  top: 0;
  left: 0;
  will-change: transform;
  transform-style: preserve-3d;
  backface-visibility: hidden;
}

.stf__item {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #fff;
  box-shadow: 0 0 8px rgba(0,0,0,0.2);
}

.stf__shadow {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}