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HTML 

              
                <div class="wrapper">
  <div class="main">
    <div class="inner">
      <div class="screen">
        <div class="pong">loading...</div>
      </div>
    </div>
    <div class="side"></div>
  </div>
</div>
<div class="shade"></div>
!

CSS 

              
                $bodyLight:#f1ebcf;
$bodyDark:#e0d9ba;
*{
  box-sizing:border-box;
}
body{
  // padding:5em;
  background:#ddd;
  font-size:2em;
}
.wrapper{
  display:block;
  // background:red;
  perspective: 1000px;
  width:10em;
  margin:5em auto 0;
}
.main{
  width:12em;
  height:10em;
  background:$bodyLight;
  background:linear-gradient(to bottom right, $bodyLight,$bodyDark);
  border-radius:5px;
  // overflow:hidden;
  border-top:1px solid lighten($bodyLight,5%);
  border-left:1px solid lighten($bodyLight,5%);
  border-right:1px solid darken($bodyDark,5%);
  border-bottom:.1em solid darken($bodyDark,10%);
  padding:1em;
  position:relative;
  transform: rotateY(20deg) rotateZ(4deg);
  perspective: 1000px;
  &:before{
    content:'';
    display:block;
    position:absolute;
    bottom:0;
    right:1em;
    height:.5em;
    width:.2em;
    background:black;
    background:radial-gradient(circle,white 5%,lighten(green,20%) 10%,#444 100%);
    border-top:1px solid darken($bodyDark,10%);
    border-left:1px solid darken($bodyDark,10%);
    border-right:1px solid lighten($bodyLight,10%);
    animation:powerlight 1s infinite linear;
  }
  &:after{
    content:'Pong 2000';
    display:block;
    position:absolute;
    bottom:.3em;
    left:1em;
    font-family:sans-serif;
    font-weight:bold;
    font-style:italic;
    color:rgba(black,.3);
    font-size:.4em;
  }
}
.side{
  content:'';
  display:block;
  position:absolute;
  top:0%;
  right:100%;
  height:100.5%;
  width:5em;
  border-top:1px solid lighten($bodyLight,5%);
  // border-left:2px solid lighten($bodyLight,5%);
  // border-bottom:2px solid darken($bodyDark,15%);
  border-radius:.5em 0 0 .5em;
  background:linear-gradient($bodyLight,darken($bodyDark,10%));
  transform:rotateY(-60deg);// translateZ(-2.1em);
  transform-origin: 100% 0%;
}
.inner{
  height:100%;
  // border-top:1em solid $bodyDark;
  background:linear-gradient(to top left, lighten($bodyLight,5%),darken($bodyDark,10%));
  border-top:1em solid darken($bodyDark,10%);
  border-left:.3em solid darken($bodyDark,5%);
  border-right:1em solid lighten($bodyLight,2%);
  border-bottom:1em solid lighten($bodyLight,5%);
  padding:.2em .3em;
  &:before{
    box-sizing:border-box;
    content:"";
    display:block;
    // width:1em;
    height:.5em;
    position:absolute;
    bottom:-.7em;
    left:7%;
    // margin-left:-2em;
    border-top:.6em solid darken($bodyDark,20%);
    border-left:1em solid transparent;
  }
  &:after{
    content:"";
    display:block;
    width:6em;
    height:.5em;
    position:absolute;
    bottom:-.7em;
    left:40%;
    margin-left:-3em;
    background:$bodyDark;
    background:linear-gradient(to bottom, darken($bodyDark,20%), $bodyDark);
    border-right:2px solid darken($bodyDark,15%);
    border-left:.1em solid darken($bodyDark,15%);
    border-bottom:.1em solid darken($bodyDark,20%);
  }
}

.screen{
  background:black;
  height:100%;
  border-top-left-radius:3em .5em;
  border-top-right-radius:3em .5em;
  border-bottom-left-radius:3em .5em;
  border-bottom-right-radius:3em .5em;
  overflow:hidden;
  position:relative;
  padding:.3em .7em;
  &:before{
    content:'';
    display:block;
    position:absolute;
    z-index:2;
    width:100%;
    height:120%;
    top:-25%;
    left:50%;
    background:linear-gradient(to bottom,rgba(white,.5),transparent);
    transform:rotate(-15deg);
  }
}

.pong{
  padding-top:1em;
  color:rgba(white,.4);
  font-family:monospace;
  text-align:center;
}

@keyframes powerlight{
  0%{
    background:radial-gradient(circle,rgba(white,1) 5%,rgba(lighten(green,20%),1) 10%,#444 100%);
  }
  50%{
    background:radial-gradient(circle,rgba(white,0) 5%,rgba(black,.4) 10%,#444 100%);
  }
  100%{
    background:radial-gradient(circle,rgba(white,1) 5%,rgba(lighten(green,20%),1) 10%,#444 100%);
  }
}
.shade{
  position:relative;
  height:6em;
  width:12em;
  margin:0 auto;
  background:radial-gradient(rgba(black,.3),transparent 70%);
  transform: rotateX(80deg);
}

///

.pong{
  width:8em;
  height:6em;
  background:green;
}
$size:1em;
$speed:1500ms;
$green:#8cdb8b;
$black:#353c39;

$size-double:2 * $size;
$size-neg:0 - $size;

.pong{
    // margin:10em auto;
    width:8em;
    height:6em;
    background:$black;
    position:relative;
    // border:1em solid #222;
    display:block;
    overflow:hidden;
    text-indent:100%;
    box-shadow:
        inset $black 0 0 0 0,
        inset $black 0 (4 * $size-neg) 0 0,
        inset $black (0.3 * $size-neg) 0 0 0,
        inset $green $size-neg 0 0 0
    ;
    animation:paddle_one $speed infinite linear;
}

.pong:before{
    position:absolute;
    top:0;
    left:0;
    display:block;
    content:"";
    width:$size;
    height:100%;
    box-shadow:
        inset $black 0 0 0 0,
        inset $black 0 (4 * $size-neg) 0 0,
        inset $black (0.3 * $size) 0 0 0,
        inset $green $size-neg 0 0 0
    ;
    animation:paddle_two $speed infinite linear; 
}

.pong:after{
    content:"";
    display:block;
    border-radius:50%;
    position:absolute;
    left:0;
    top:0;
    width:$size;
    height:$size;
    background:$green;
    animation:ball $speed infinite linear;
}

@keyframes ball{
    0%   {
        left:0.5 * $size;
        top:0;
    }
    25%   {
        left:6.5 * $size;
        top:2 * $size;
    }
    50%   {
        left:0.5 * $size;
    }
    62.5% {
        top:5 * $size;
    }
    75%   {
        left:6.5 * $size;
        top:70%;
    }
    100%   {
        left:0.5 * $size;
        top:0%;
    }
}


@keyframes paddle_one{
    0%   {
        box-shadow:
            inset $black 0 (0.5 * $size) 0 0,
            inset $black 0 (3.5 * $size-neg) 0 0,
            inset $black (0.3 * $size-neg) 0 0 0,
            inset $green $size-neg 0 0 0
        ;
    }
    25%   {
        box-shadow:
            inset $black 0 (1.5 * $size) 0 0,
            inset $black 0 (2.5 * $size-neg) 0 0,
            inset $black (0.3 * $size-neg) 0 0 0,
            inset $green $size-neg 0 0 0
        ;
    }
    50%   {
        box-shadow:
            inset $black 0 0 0 0,
            inset $black 0 (4 * $size-neg) 0 0,
            inset $black (0.3 * $size-neg) 0 0 0,
            inset $green $size-neg 0 0 0
        ;
    }
    62.5% {
        box-shadow:
            inset $black 0 $size 0 0,
            inset $black 0 (3 * $size-neg) 0 0,
            inset $black (0.3 * $size-neg) 0 0 0,
            inset $green $size-neg 0 0 0
        ;
    }
    75%   {
        box-shadow:
            inset $black 0 (4 * $size) 0 0,
            inset $black 0 0 0 0,
            inset $black (0.3 * $size-neg) 0 0 0,
            inset $green $size-neg 0 0 0
        ;
    }
    100%   {
        box-shadow:
            inset $black 0 (0.5 * $size) 0 0,
            inset $black 0 (3.5 * $size-neg) 0 0,
            inset $black (0.3 * $size-neg) 0 0 0,
            inset $green $size-neg 0 0 0
        ;
    }
}

@keyframes paddle_two{
    0%   {
        box-shadow:
            inset $black 0 0 0 0,
            inset $black 0 (4 * $size-neg) 0 0,
            inset $black (0.3 * $size) 0 0 0,
            inset $green $size-neg 0 0 0
        ;
    }
    50%   {
        box-shadow:
            inset $black 0 (3 * $size) 0 0,
            inset $black 0 $size-neg 0 0,
            inset $black (0.3 * $size) 0 0 0,
            inset $green $size-neg 0 0 0
        ;
    }
    62.5% {
        box-shadow:
            inset $black 0 (4 * $size) 0 0,
            inset $black 0 0 0 0,
            inset $black (0.3 * $size) 0 0 0,
            inset $green $size-neg 0 0 0
        ;
    }
    75%   {
        box-shadow:
            inset $black 0 (2 * $size) 0 0,
            inset $black 0 (2 * $size-neg) 0 0,
            inset $black (0.3 * $size) 0 0 0,
            inset $green $size-neg 0 0 0
        ;
    }
    100%   {
        box-shadow:
            inset $black 0 0 0 0,
            inset $black 0 (4 * $size-neg) 0 0,
            inset $black (0.3 * $size) 0 0 0,
            inset $green $size-neg 0 0 0
        ;
    }
}
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