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CSS

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HTML 

              
                <div class="wrapper">
  <div class="form-section current front">
    <h1>Check Yourself Out <i class="fa fa-lock" aria-hidden="true"></i></h1>
    <form id="cardinfo" name="ccform">
    <input name="cardnumber" onkeypress='validate(event)' placeholder="Card Number" class="cardnumber form-field" type='tel' required/>
    <input class="cardname form-field" type="text" placeholder="Name" required/>
    <input onkeypress='validate(event)' class="month form-field" type="text" placeholder="DD" maxlength="2" required/><span>/</span>
    <input class="year form-field" type="text" placeholder="YY" maxlength="2" required/>
      <input id="submit1" class="button1" type="submit" value="NEXT" />
    </form>
  </div>
  <div class="form-section back">
    <h1>Continue Checkout <i class="fa fa-lock" aria-hidden="true"></i></h1>
     <form id="cardinfo2">
    <input id="cvv" class="cvv" type="text" placeholder="CVV" maxlength="4" required/>
       <input id="submit2" type="submit" />
    </form>
  </div>
</div>
<h1 class="success"><i class="fa fa-thumbs-o-up" aria-hidden="true"></i> Much Success!</h1>
!

CSS 

              
                @font-face{
    font-family:Credit;
    font-weight:100;
    src:local(※), url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/383755/halter__-webfont.woff) format('woff');
}

$main : 'Credit', sans-serif;
$header : 'Inconsolata', monospace;
$gray : #eee;
$purple : #9249ff;
$white : #fff;

@mixin centered(){
  position:absolute;
  left:50%;
  top:50%;
  transform:translateX(-50%) translateY(-50%);
}

body{
    margin:0px;
    background:$gray;
    height:100vh;
    width:100%;
    overflow:hidden;
    transition:0.3s ease-in-out;
      &:before{
      content:'';
      transition:0.3s ease-in-out;
      width:350%;
      height:250%;
      display:block;
      position:absolute;
      right:-10%;
      top:-10%;
      background: -moz-radial-gradient(center, ellipse cover,  $purple 0%, rgba(0,0,0,0) 40%); /* FF3.6-15 */
      background: -webkit-radial-gradient(center, ellipse cover,  $purple 0%,rgba(0,0,0,0) 40%); /* Chrome10-25,Safari5.1-6 */
      background: radial-gradient(ellipse at center,  $purple 0%,rgba(0,0,0,0) 40%); /* W3C, IE10+, FF16+, Chrome26+, Opera12+, Safari7+ */
      filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#a6000000', endColorstr='#00000000',GradientType=1 ); /* IE6-9 fallback on horizontal gradient */

    }
  .wrapper{
    display:block;
    position:relative;
    width:100vw;
    height:100vh;
    -webkit-perspective: 800px;
    perspective: 800px;
    -webkit-transform-style: preserve-3d;
    transform-style: preserve-3d;

    .form-section{
      position:absolute;
      width:500px;
      height:300px;
      border-radius:15px;
      border:4px solid $purple;
      padding:2em;
      backface-visibility: hidden;
      justify-content:flex-start;
      box-shadow:0px 25px 25px -20px darken($gray, 10%);
      @include centered();
      form{
        position:absolute;
        bottom:1em;
        max-width:90%;
        left:1.5em;
      }
      h1{
          font-family:$header;
          font-size:2.5em;
          position:absolute;
          left:1em;
          top:0.5em;
          color:$purple;
          width:90%;
        i{
          font-size:1.25em;
          display:inline-block;
          margin-top:-0.15em;
          margin-right:0.25em;
          float:right;
        }
        }
      .innerwrap{
        height:auto;
        align-self:flex-end;

      }
      input{
        width:100%;
        flex:flex-grow;
        clear:both;
        background:transparent;
        border:0px solid;
        border-bottom:4px solid $purple;
        font-family:$main;
        color:$purple;
        font-size:1.4em;
        margin-bottom:1em;
        &::-webkit-input-placeholder{
          color:darken($gray, 15%);
        }
        &:focus{
          outline:none;
          border-bottom:4px solid transparent;
        }
        &:invalid{
          border-bottom:4px solid $purple;
        }
        &:valid{
          border-bottom:4px solid transparent;
        }
      }
      .cardname{
        width:73.2%;
        text-transform:uppercase;
      }
      .month{
        width:8%;
        margin:0 1%;
      }
      .year{
        width:8%;
      }
      span{
        color:$purple;
        font-size:1.5em;
      }
    }
    input.show{
      display:inline-block !important;
      transition:0.2s ease-in-out;
      position:absolute;
      bottom:-80px;
      right:-90px;
      max-width:140px;
      background:$purple;
      text-align:center;
      padding:0.6em 0;
      color:$white;
      border:4px solid $purple;
      border-bottom:4px solid $purple !important;
      border-radius:10px;
      animation-name:scaleIn;
      animation-duration:0.4s;
      animation-iteration-count:1;
      @keyframes scaleIn{
        0%{
          transform:scale(0);
        }
        80%{
          transform:scale(1.05);
        }
        100%{
          transform:scale(1);
        }
      }
      &:hover{
        color:$purple;
        background:$gray;
      }
      
    }
    input[type="submit"]{
      font-family:$header;
      letter-spacing:2px;
      display:none;
    }
    .front{
      z-index: 2;
      background:$gray;
      &:before{
        content:'';
        position:absolute;
        width:100%;
        height:100%;        
        background:url('https://puu.sh/qMT9D/a44061812c.svg');
        background-size:10px;
        border-radius:15px;
        z-index:-5;
        top:20px;
        left:20px;
      }
      &:after{
        content:'';
        position:absolute;
        width:100%;
        height:100%;        background:$gray;
        background-size:10px;
        border-radius:15px;
        z-index:-4;
        top:0;
        left:0;
      }
    }
    .back{
      transform:translateX(-50%) translateY(-50%) rotateY(180deg);
      z-index:1;
      &:before{
        content:'';
        position:absolute;
        width:100%;
        height:100%;          background:url('https://puu.sh/qMT9D/a44061812c.svg');
        background-size:10px;
        border-radius:15px;
        z-index:-5;
        top:20px;
        left:-20px;
      }
      &:after{
        content:'';
        position:absolute;
        width:100%;
        height:100%;        
        background:$gray;
        background-size:10px;
        border-radius:15px;
        z-index:-4;
        top:0;
        left:0;
      }
      form{
        position:absolute;
        top:70%;
        left:50%;
        transform:translateX(-50%) translateY(-50%);
        width:20%;
      }
      .cvv{
        max-width:100%;
        float:right;
        text-align:center;
      }
      #submit2{
        display:block;
        width:180px;
        position:absolute;
        left:50%;
        transform:translateX(-50%);
        bottom:-50%;
        text-transform:uppercase;
        background:$purple;
        color:$white;
        border-radius:10px;
        padding:0.5em 0;
        transition:0.2s ease-in-out;
        border:4px solid $gray;
        &:hover{
          background:$gray;
          color:$purple;
          border:4px solid $purple;
        }
      }
      h1{
        &:after{
          content:'';
          position:absolute;
          display:block;
          width:120%;
          height:60px;
          left:-1em;
          max-width: 565px;
          top:120%;
          background:$purple;
        }
      }
     }
  }
}

.success{
  position:absolute;
  @include centered();
  color:$white;
  font-family:$header;
  font-size:2em;
  top:100%;
  transition-delay:0.4s;
  transition:0.4s ease-in-out;
}

.submitted{
  background:$purple;
  .success{
    top:50%;
  }
  &:before{
      content:'';
      width:350%;
      height:250%;
      display:block;
      position:absolute;
      right:-10%;
      top:-10%;
      background: -moz-radial-gradient(center, ellipse cover,  $gray 0%, rgba(0,0,0,0) 40%); /* FF3.6-15 */
      background: -webkit-radial-gradient(center, ellipse cover,  $gray 0%,rgba(0,0,0,0) 40%); /* Chrome10-25,Safari5.1-6 */
      background: radial-gradient(ellipse at center,  $gray 0%,rgba(0,0,0,0) 40%); /* W3C, IE10+, FF16+, Chrome26+, Opera12+, Safari7+ */
      filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#a6000000', endColorstr='#00000000',GradientType=1 ); /* IE6-9 fallback on horizontal gradient */
  }
}
!

JS 

              
                $('input.cardnumber').payment('formatCardNumber');

$("#cardinfo").submit(function(e){
    TweenMax.to(".wrapper", 1.5, {transformOrigin:"50% 50%", delay:0, rotationY:180, ease: Elastic.easeOut.config(0.3, 0.3)});
    $("#cvv").focus();
    return false;
    
});

$("#cardinfo2").submit(function(e){
    TweenMax.to(".form-section", .5, {transformOrigin:"50% 50%", delay:0, y:-1000, ease: Elastic.easeOut.config(0.3, 0.3)});
    $('body').addClass('submitted');
    return false;
});

function validate(evt) {
  var theEvent = evt || window.event;
  var key = theEvent.keyCode || theEvent.which;
  key = String.fromCharCode( key );
  var regex = /[0-9]|\./;
  if( !regex.test(key) ) {
    theEvent.returnValue = false;
    if(theEvent.preventDefault) theEvent.preventDefault();
  }
}

$('.year').keyup(function(){
        if(this.value.length==$(this).attr("maxlength")){
            $('.button1').addClass("show");
        }
    });
!
999px

Console