.screen {

  position: relative;
  margin: 0 auto;
  margin-top: -40px;
  background: #ffffff;
  transform: translateZ(0) perspective(1400px) rotateX(60deg) rotateZ(40deg);
  box-shadow: 1px 2px 5px #444;
  animation: anim 1s infinite ease-in-out alternate;
}

/* img, */
.screen-paper {
  width: 288px;
  height: 512px;
}

@keyframes anim {
  100% {
    transform: translateZ(0) translateY(-50px) perspective(1250px) rotateX(60deg) rotateZ(40deg);
    box-shadow: 60px 60px 50px #999;
  }
}