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HTML 

              
                .screen.one
 %h1 Every Website in 2018
 %a.btn Enter
.screen.two
 %p cobra winfrey wants to<br>show notifications
 %a.btn Allow
 %a.btn Block
.screen.three
 %p are you sure you want to <br>change your homepage<br> to this website?
 %a.btn Yes
 %a.btn No
.screen.four
 %p We value your privacy.  In an age of unsolicited emails, you can trust Cobra Winfrey to keep your information confidential. We are a company that will protect and safeguard the privacy of our customers. See our privacy policy below for the details of our pledge to your privacy.
.screen.five
 %h1 Are you over 18?
 %p This website requires you to be 18 or older to enter
 %a.btn.enter Yes
 %a.btn No
 .datepicker
  %input{:type => "number"}/
  %input{:type => "number"}/
  %input{:type => "number"}/
  %a.btn.submit Submit
.screen.six
 %h1 Is your city Gary, Indiana?
 %a.btn Yes
 %a.btn No
.screen.seven
 %img{:src => "https://puu.sh/BPuFj/f3dc332522.svg"}/
 %h1 Please subscribe to our newsletter and don't miss any important news.
 %input{:type => "email", :value => "your email"}/
 %a.btn Submit
.screen.eight
 %b Support Team: Cobra
 %p Can I help you today?
 %a.btn Yes
 %a.btn No Thanks
.screen.nine
 %h1 It looks like you're using an ad blocker.
 %p Please consider disabling your ad blocker, ad revenue powers our content and we swear the ads are nowhere near as intrusive as everything you've been subjected to thus far.
 %a.btn Got It!
.screen.ten
 %h1 Did you find what you were looking for?
 %a.btn Yes
 %a.btn No 
.screen.eleven
 %h1 Aw Snap!
 %p Something went wrong while displaying this page. To continue, refresh or visit another page. 
.screen.twelve
 %h2 Don't forget to subscribe to our Social Media!
 %i.fab.fa-facebook
 %i.fab.fa-twitter-square
 %i.fab.fa-codepen
 %i.fab.fa-linkedin
!

CSS 

              
                body{
  display:flex;
  justify-content:center;
  align-items:center;
  width:100vw;
  height:100vh;
  overflow:hidden;
  background:#222;
  perspective:800px;
  .screen{
    position:absolute;
    text-align:center;
    position:absolute;
    display:inline-block;
    transition:0.5s ease-in-out;
    *{
      color:#fff;
      text-align:center;
      font-weight:100;
    }
    input{
      z-index:2;
      position:absolute;
    }
    .btn{
      text-align:center;
      display:inline-block;
      background:blue;
      text-transform:uppercase;
      padding:15px 40px;
      border-radius:5px;
      font-weight:900;
      transition:0.2s ease-in-out;
      cursor:pointer;
      &:hover{
        background:darken(blue, 5%);
      }
    }
    h1{
      margin:0 0 20px;
    }
    &:nth-of-type(12){
      background:#000;
      padding:50px;
      transform:scale(0);
      transition:0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
      &.hithere{
        transform:scale(1);
      }
      i{
        font-size:50px;
        margin:0 10px;
        transition:0.2s ease-in-out;
        &:hover{
          color:blue;
        }
      }
      h2{
        margin-top:0;
      }
    }
    &:nth-of-type(11){
      opacity:0;
      pointer-events:none;
      p{
        max-width:375px;
      }
      &.hithere{
        opacity:1;
      }
    }
    &:nth-of-type(10){
      transform-style:preserve-3d;
      pointer-events:none;
      backface-visibility:hidden;
      padding:50px;
      background:rgba(255,255,255,0.15);
      transform:rotateX(-180deg);
      transition:0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
      .btn{
        margin:0 10px;
      }
      &.hithere{
        transition-delay:0.5s;
        transform:rotateX(0deg);
        pointer-events:all;
        &.byebye{
          transition:0.4s ease-in-out;
          transition-delay:0s;
          transform:translateY(150vh);
        }
      }
    }
    &:nth-of-type(9){
      z-index:999;
      opacity:0;
      pointer-events:none;
      &.hithere{
        opacity:1;
        pointer-events:all;
        &.byebye{
          opacity:0;
          pointer-events:none;
        }
      }
      p, h1{
        max-width:500px;
        width:90%;
        display:block;
        margin:20px auto;
      }
      .btn{
        border-radius:50px;
      }
      &:before{
        content:'';
        position:absolute;
        width:200vw;
        height:300vh;
        top:-100vh;
        left:-75vw;
        background:rgba(0,0,0,0.85);
        z-index:-1;
      }
    }
    &:nth-of-type(8){
      width:250px;
      height:400px;
      max-height:90vh;
      background:#fff;
      padding:20px;
      border-radius:10px;
      bottom:0;
      right:10px;
      transition:0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
      transform:translateY(100vh);
      &.hithere{
        transform:translateY(0vh);
        &.byebye{
          transform:translateY(100vh);
        }
        &:before{
          transform:translateY(0vh);
        }
        p{
          opacity:1;
        }
      }
      &:before{
        content:'';
        position:absolute;
        width:75px;
        height:75px;
        background:url('https://puu.sh/BPuT5/12a182d0d5.svg');
        background-position:center;
        background-size:cover;
        bottom:10px;
        right:10px;
        transition:0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
        transition-delay:0.3s;
        transform:translateY(100px);
      }
      p, b{
        color:#000;
        text-align:left;
        display:inline-block;
        width:100%;
      }
      p{
        opacity:0;
        transition:0.2s ease-in-out;
        transition-delay:0.5s;
      }
      b{
        font-weight:900;
      }
      .btn{
        position:absolute;
        padding:10px;
        bottom:10px;
        left:20px;
        &:nth-of-type(2){
          left:80px;
        }
      }
    }
    &:nth-of-type(7){
      transform:translateY(-150vh);
      background:rgba(255,255,255,0.15);
      padding:25px 50px 50px 50px;
      img{
        display:block;
        margin:0px auto;
        max-width:150px;
      }
      &.hithere{
        transform:translateY(0vh);
        &.byebye{
          transform:translateX(-150vw);
        }
      }
      h1{
        max-width:500px;
        margin-top:0;
        font-weight:100;
      }
      input{
        display:inline-block;
        float:left;
        text-align:left;
        position:relative;
        width:calc(100% - 150px);
        height:47.5px;
        background:#222;
        border:none;
        box-shadow:none;
        border-radius:5px;
        text-align:center;
        color:#555;
      }
      .btn{
        position:relative;
        float:right;
      }
    }
    &:nth-of-type(6){
      transform:translateY(-100vh);
      .btn{
        margin:0 10px;
      }
      &.hithere{
        transform:translateY(0);
        &.notyet{
          transform:translateY(-100vh);
        }
        &.byebye{
          transform:translateY(100vh);
        }
      }
    }
    &:nth-of-type(5){
      transform:translateX(-100vw);
      background:rgba(255,255,255,0.15);
      padding:25px 50px;
      margin-top:-25px;
      .btn{
        margin:0;
      }
      input{
        height:47.5px;
        width:40px;
        display:inline-block;
        float:left;
        color:#222;
        position:relative;
        margin-right:10px;
        border:none;
      }
      .datepicker{
        display:table;
        width:100%;
        text-align:left;
        margin-top:20px;
        transform:scaleY(0);
        transition:0.2s ease-in-out;
        transform-origin:top;
        max-width:335px;
        input{
          &:last-of-type{
            width:80px;
            margin-right:0;
          }
        }
        &.hithere{
          transform:scaleY(1);
        }
        .btn{
          float:right;
        }
      }
      &.hithere{
        transform:translateX(0);
        &.byebye{
          transform:translateY(-50px);
          &.gtfo{
            transform:translateY(125vh);
          }
        }
      }
    }
    &:nth-of-type(4){
      bottom:0;
      width:100%;
      padding:50px;
      background:rgba(0,0,0,0.5);
      transform:translateY(100%);
      transition-delay:1s;
      &.hithere{
        transform:translateY(0);
        transition-delay:0s;
      }
      p{
        max-width:80%;
        display:block;
        margin:0px auto;
      }
    }
    &:nth-of-type(2), &:nth-of-type(3){
      background:#eee;
      padding:20px 60px;
      top:0;
      left:25px;
      transform:translateY(-150%);
      &:before{
        content:'';
        position:absolute;
        width:75px;
        height:75px;
        background:url('https://puu.sh/BPvlJ/ceec6d016b.svg');
        background-size:contain;
        background-repeat:no-repeat;
        top:30px;
        left:20px;
      }
      &.three{
        left:auto;
        right:25px;
        &:before{
          top:45px;
        }
      }
      &.hithere{
        transform:translateY(0);
        &.byebye{
          transform:translateY(-150%);
        }
      }
      p{
        line-height:2;
        padding-left:50px;
      }
      a{
        position:absolute;
        background:#eee;
        border-radius:0;
        box-shadow:inset 0 0 0 1px #222;
        width:50%;
        padding:15px 0;
        bottom:-50px;
        &:hover{
          background:#ddd;
        }
        &:first-of-type{
          left:-1px;
        }
        &:last-of-type{
          right:-1px;
        }
      }
      *{
        color:#222;
      }
      
    }
    &:first-of-type{
      &.byebye{
        transform:translateY(-100vh);
        pointer-events:none;
        .btn{
         transition:0.5s ease-in-out; transform:translateY(200vh);
        }
      }
    }
  }
}
!

JS 

              
                $('.btn').click(function(){
  $(this).parent().removeClass("notyet");
  $(this).parent().addClass("byebye");
  $(this).parent().next().addClass("hithere");
  if ($(".four").hasClass("hithere")) {
    setTimeout(function(){
      $(".four").removeClass("hithere");
      $(".five").addClass("hithere");
    }, 2000);
  }
  if ($(".eleven").hasClass("hithere")) {
    setTimeout(function(){
      $(".eleven").removeClass("hithere");
      $(".twelve").addClass("hithere");
    }, 3000);
  }
});

$(".five .enter").click(function(){
  $(".datepicker").addClass("hithere");
  $(".six").addClass("notyet");
});

$(".submit").click(function(){
  $(".five").addClass("gtfo");
  $(".six").removeClass("notyet");
});
!
999px

Console