.modal-overlay {

 width: 100%;
 height: 100%;
 z-index: 99999;
 background-color: black;
 opacity: .8;
 display: none;
 position: fixed;
 top:0;
 left: 0;

 -webkit-box-shadow: 0 0 15px #fff;
 -moz-box-shadow: 0 0 15px #fff;
  -o-box-shadow: 0 0 15px #fff;
  box-shadow: 0 0 15px #fff;
  
}

.modal-window-animate {

   transition: top .7s ease-in;
   -o-transition: top .7s ease-in;
   -moz-transition: top .7s ease-in;
   -webkit-transition: top .7s ease-in;
}