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HTML 

              
                <div class="main">
  <div class="top half">
    <img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/142996/avengers2.jpg" />
  </div>
  <div class="bottom half">
    <img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/142996/avengers2.jpg" />
  </div>
  <button class="super-button">Enter</button>
  <div class="overlay"></div>
  <div class="button-line left">
    <div class="inner"></div>
  </div>
  <div class="button-line right">
    <div class="inner"></div>
  </div>
</div>
<div class="content">
  <div class="hello">Welcome!</div>
  <nav>
    <ul>
      <li class="active"><a href="#">Hulk crush!</a></li>
      <li><a href="#">Such movie</a></li>
      <li><a href="#">Wow!</a></li>
      <li><a href="#">Very avengers</a></li>
      <li><a href="#">Much comics</a></li>
    </ul>
  </nav>
</div>
!

CSS 

              
                @import "compass/css3";

@font-face {
  font-family: decade;
  src: url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/142996/decade.ttf');
}
@mixin transition($dur) {
  -webkit-transition: $dur;
  -moz-transition: $dur;
  -ms-transition: $dur;
  -o-transition: $dur;
  transition: $dur;
}
@mixin transitionDelay($dur) {
  -webkit-transition-delay: $dur;
  -moz-transition-delay: $dur;
  -ms-transition-delay: $dur;
  -o-transition-delay: $dur;
  transition-delay: $dur;
}
@mixin translateXY($x: 0, $y: 0) {
  -webkit-transform: translateX($x) translateY($y);
  -moz-transform: translateX($x) translateY($y);
  -ms-transform: translateX($x) translateY($y);
  -o-transform: translateX($x) translateY($y);
  transform: translateX($x) translateY($y);
}
@mixin translateXYandScale($x: 0, $y: 0, $scale: 0) {
  -webkit-transform: translateX($x) translateY($y) scale($scale);
  -moz-transform: translateX($x) translateY($y) scale($scale);
  -ms-transform: translateX($x) translateY($y) scale($scale);
  -o-transform: translateX($x) translateY($y) scale($scale);
  transform: translateX($x) translateY($y) scale($scale);
}
@mixin rotate($deg) {
  -webkit-transform: rotate($deg);
  -moz-transform: rotate($deg);
  -ms-transform: rotate($deg);
  -o-transform: rotate($deg);
  transform: rotate($deg);
}
@mixin scale($val) {
  -webkit-transform: scale($val);
  -moz-transform: scale($val);
  -ms-transform: scale($val);
  -o-transform: scale($val);
  transform: scale($val);
}
@mixin clearfix {
  content: "";
  display: table;
  clear: both;
}
$green: #c7ff66;
$gray: #dcdcdc;
$lightGray: #8f8f8f;
$darkBg: rgba(49,49,49, .7);
$red: #ff5954;
*, *:before, *:after {
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
  @include transition(.3s);
  list-style-type: none;
  margin: 0;
  padding: 0;
}
a {
  color: inherit;
  text-decoration: none;
}
html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
}
body {
  font-family: decade;
}
.half {
  position: absolute;
  overflow: hidden;
  z-index: 50;
  left: 0;
  width: 100%;
  height: 50%;
  @include transition(3s);
  will-change: transform;
  
  img {
    position: absolute;
    top: -10%;
    left: 0;
    width: 100%;
  }
  
  &.top {
    top: 0;
  }
  
  &.bottom {
    top: 50%;

    img {
      top: -110%;
    }
  }
  
  &.active.top {
    @include translateXY(0, -100%);
  }
  
  &.active.bottom {
    @include translateXY(0, 100%);
  }
}
.super-button {
  position: absolute;
  left: 50%;
  top: 50%;
  z-index: 200;
  width: 200px;
  height: 80px;
  opacity: 0.8;
  @include translateXY(-50%, -50%);
  text-transform: uppercase;
  font-size: 40px;
  font-weight: bold;
  color: $lightGray;
  background-color: transparent;
  border: 4px solid rgba(143,143,143, 0.5);
  @include transition(1.5s);
  will-change: color, opacity, border-color;
  
  &:hover {
    color: #fff;
    opacity: 1;
    border-color: #fff;
  }
  
  &:hover ~ .overlay {
    background-color: rgba(155, 0, 0, .5);
  }
  &:hover ~ .overlay.active {
    background-color: transparent;
  }
  
  &:hover ~ .button-line .inner {
    max-width: 100%;
  }
  
  &.active {
    @include transition(4.5s);
    @include translateXY(-50%, -1000px);
  }
  
}
.overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 100;
  background-color: rgba(155, 0, 0, 0);
  @include transition(1.5s);
  will-change: background-color;
  
  &.active {
    background-color: transparent;
  }
}
.button-line {
  position: absolute;
  top: -webkit-calc(50% - 2px);
  top: -moz-calc(50% - 2px);
  top: calc(50% - 2px);
  left: 0;
  z-index: 200;
  width: -webkit-calc(50% - 100px);
  width: -moz-calc(50% - 100px);
  width: calc(50% - 100px);
  height: 4px;
  background-color: rgba(143,143,143, 0.5);
  @include transition(.5s);
  will-change: width, max-width;
  
  &.left {
    @include rotate(180deg);
  }
  
  &.right {
    left: -webkit-calc(50% + 100px);
    left: -moz-calc(50% + 100px);
    left: calc(50% + 100px); 
  }
  
  .inner {
    width: 100%;
    height: 100%;
    background-color: #fff;
    max-width: 0;
    @include transition(1.5s);
  }
  
  &.active {
    opacity: 0;
  }
}
.content {
  position: absolute;
  padding: 50px;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 40;
  background-color: #1d1f20;
  
  .hello {
    font-size: 50px;
    font-weight: bold;
    color: $red;
    text-transform: uppercase;
    position: absolute;
    top: 50%;
    left: 50%;
    opacity: 0;
    @include translateXYandScale(-50%, -50%, 0.5);
    @include transition(1s);
  }
  
  nav {
    margin: 0 auto;
    border: 2px solid #fff;
    opacity: 0;
    @include scale(0.5);
    @include transition(1s);
    max-width: 900px;
    
    ul {
      font-size: 0;
      
      li {
        display: inline-block;
        font-size: 25px;
        text-transform: uppercase;
        color: #fff;
        padding: 5px 10px;
        border-right: 2px solid #fff;
        
        &:last-child {
          border-right: none;
        }
        
        &.active {
          color: $red;
        }
        
        &:hover {
          color: $red;
        }
      }
    }
  }
  
  &.active {
    
    .hello {
      opacity: 1;
      @include transitionDelay(1.5s);
      @include translateXYandScale(-50%, -50%, 1);
    }
    
    nav {
      @include transitionDelay(1.5s);
      @include scale(1);
      opacity: 1;
    }
  }
}
!

JS 

              
                $(document).ready(function() {
  $(document).on("click", ".super-button", function() {
    $(".main, .half, .overlay, .button-line, .super-button, .content").addClass("active");
    setTimeout(function() {
      $(".main *").css("z-index", "1");
    }, 3000);
  });
});
!
999px

Console