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HTML 

              
                <div id="fullscreen">
</div>

<section class="main">
  <div class="container align-center">
    
    <button class="btn btn-ghost center-block wow zoomIn" data-wow-duration="4s" data-wow-delay="1s"><i class="fa fa-play"><span class="mask"></span></i> Start digital experience</button>
    
  </div>

</section>

<div id="meta">
  <div id="winSize">850px</div>
  <div id="winMid">850px</div>
  <div id="btnSize">850px</div>
  <div id="mTop">850px</div>
</div>


<script>
    
</script>
!

CSS 

              
                html, body { 
  position:relative;
  height:100%;
  color:#fff;
  font-family: 'Roboto', sans-serif;
  font-size:16px;
  font-weight:100;
  
}

#fullscreen {
  width:100%;
  height:100%;
  background:url('http://cdn.paper4pc.com/images/dark-forest-wallpaper-5.jpg') center center no-repeat;
  background-size:cover;
  position:fixed;
  z-index:-1;
}

#fullscreen:after {
  content:"";
  position:absolute;
  top:20px; bottom:20px;
  left:20px; right:20px;
  background:transparent; 
  border:1px solid #fff;
  z-index:999;
}

.main { padding:50px 0;}

.btn-ghost { 
  border-radius:0; 
  background:transparent;
  border:1px solid #fff;
  font-size:18px;
  font-weight:100;
  text-transform:uppercase;
  padding:1em;
  display:block;
  transition:all .4s ease;
  color:#fff;
  position:relative;
  /*box-shadow:0 0 20px 2px rgba(255,255,255,.2);*/
}

.btn-ghost:before {
  content:"";
   background:rgba(255,255,255,.2);
  width:calc(100% - 3.9em);
  height:2.85em;
  position:absolute;
  bottom:.27em;
  right:.25em;
  transition:all .2s ease;
}

.btn-ghost:hover:before {
  
  height:0em;
  
  
  
}

.btn-ghost:hover { color:#fff; 
  box-shadow:0 0 20px 2px rgba(255,255,255,.2);}

.btn-ghost i {position:relative;
  margin-right:2em;
  margin-left:.25em;
 
}
.btn-ghost i .mask {
  position:absolute;
  width:2.8em;
  height:2.8em;
  background:rgba(255,255,255,.2);
  top:-.925em;
  left:-1em;
  transition:all .2s ease;
  
}

.btn-ghost:hover i .mask {
  
  height:0em;
  
  
}


.btn-ghost i:after {
  content:"";
  width:1px;
  height:3.4em;
  background:#fff;
  position:absolute;
  margin-top:-1.25em;
  margin-left:1.25em;
  
}

#meta {position:fixed;
right:40px;
top:40px;
background:rgba(255,255,255,.2);
  padding:10px;
  font-size:10px;
  opacity:.3;
  transition:all .4s ease;
  cursor:help;
}

#meta:hover {opacity:1;}
!

JS 

              
                var winSize = $(window).height(),
    winMid = winSize /2,
    btnSize = $(".btn-ghost").height(),
    btnMid = btnSize /2,
    mTop = winMid - btnSize - 57;

// META 
$('#winSize').text("Taille de la fenêtre : " + winSize + "px");
$('#winMid').text("Moitié de la fenêtre : " + winMid + "px");
$('#btnSize').text("Hauteur du bouton : " + btnSize + "px");
$('#mTop').text("Hauteur de la marge : " + mTop + "px");


// CENTER TOP
$('.btn-ghost').css({"margin-top":mTop});
$(window).resize(function(){
  var winSize = $(window).height(),
    winMid = winSize /2,
    btnSize = $(".btn-ghost").height(),
    btnMid = btnSize /2,
    mTop = winMid - btnSize - 57;

// META 
$('#winSize').text("Taille de la fenêtre : " + winSize + "px");
$('#winMid').text("Moitié de la fenêtre : " + winMid + "px");
$('#btnSize').text("Hauteur du bouton : " + btnSize + "px");
$('#mTop').text("Hauteur de la marge : " + mTop + "px");


// CENTER TOP
$('.btn-ghost').css({"margin-top":mTop});
  
});



new WOW().init();
!
999px

Console