#container {
    background: white;
    color: silver;
    margin: 100px 200px 150px 200px;
    -webkit-perspective: 800px;
    -moz-perspective: 800px;
    -ms-perspective: 800px;
    -o-perspective: 800px;
    perspective: 800px;
    -webkit-perspective-origin: 50% 110px;
    -moz-perspective-origin: 50% 110px;
    -ms-perspective-origin: 50% 110px;
    -o-perspective-origin: 50% 110px;
    perspective-origin: 50% 110px;
}
@media screen and (min-width: 400px) {
    #container {
      margin-left: 50px;
    }
  }
  
  @media screen and (min-width: 800px) {
    #container {
        margin-left: 150px;
      }
    }

.face {
    position: absolute;
    height: 360px;
    width: 360px;
    padding: 20px;
    background-color: rgba(50, 50, 50, 0.4);
}

#cube {
    position: relative;
    margin: auto;
    height: 400px;
    width: 400px;
    -webkit-transform-style: preserve-3d;
    -moz-transform-style: preserve-3d;
    -ms-transform-style: preserve-3d;
    -o-transform-style: preserve-3d;
    transform-style: preserve-3d;
    -webkit-transform: rotateX(0deg) rotateY(20deg);
    -moz-transform: rotateX(0deg) rotateY(20deg);
    -ms-transform: rotateX(0deg) rotateY(20deg);
    -o-transform: rotateX(0deg) rotateY(20deg);
    transform: rotateX(0deg) rotateY(20deg);
    -webkit-animation: anim2 ease-in-out 20s infinite alternate;
    -moz-animation: anim2 ease-in-out 20s infinite alternate;
    -ms-animation: anim2 ease-in-out 20s infinite alternate;
    -o-animation: anim2 ease-in-out 20s infinite alternate;
    animation: anim2 ease-in-out 20s infinite alternate;
}

@keyframes anim2 {
    from {transform: rotateY(0deg)}
    50% {transform: rotateY(360deg)}
    to {transform: rotateY(0deg)}
}

#F1 {
    -webkit-transform: rotateX(90deg) translateZ(200px);
    -moz-transform: rotateX(90deg) translateZ(200px);
    -ms-transform: rotateX(90deg) translateZ(200px);
    -o-transform: rotateX(90deg) translateZ(200px);
    transform: rotateX(90deg) translateZ(200px);
}

#F2 {
    -webkit-transform: translateZ(200px);
    -moz-transform: translateZ(200px);
    -ms-transform: translateZ(200px);
    -o-transform: translateZ(200px);
    transform: translateZ(200px);
}

#F3 {
    -webkit-transform: rotateY(90deg) translateZ(200px);
    -moz-transform: rotateY(90deg) translateZ(200px);
    -ms-transform: rotateY(90deg) translateZ(200px);
    -o-transform: rotateY(90deg) translateZ(200px);
    transform: rotateY(90deg) translateZ(200px);
}

#F4 {
    -webkit-transform: rotateY(180deg) translateZ(200px);
    -moz-transform: rotateY(180deg) translateZ(200px);
    -ms-transform: rotateY(180deg) translateZ(200px);
    -o-transform: rotateY(180deg) translateZ(200px);
    transform: rotateY(180deg) translateZ(200px);
}

#F5 {
    -webkit-transform: rotateY(-90deg) translateZ(200px);
    -moz-transform: rotateY(-90deg) translateZ(200px);
    -ms-transform: rotateY(-90deg) translateZ(200px);
    -o-transform: rotateY(-90deg) translateZ(200px);
    transform: rotateY(-90deg) translateZ(200px);
}

#F6 {
    -webkit-transform: rotateX(-90deg) translateZ(200px) rotate(180deg);
    -moz-transform: rotateX(-90deg) translateZ(200px) rotate(180deg);
    -ms-transform: rotateX(-90deg) translateZ(200px) rotate(180deg);
    -o-transform: rotateX(-90deg) translateZ(200px) rotate(180deg);
    transform: rotateX(-90deg) translateZ(200px) rotate(180deg);
}