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<a href="#" class="btn" id="modalOpen">Open Modal</a>
<div class="modal__containter">
  
  <div class="modal hide">
    <a href="#" class="modal__close"><img src="http://image.flaticon.com/icons/png/128/61/61155.png"></a>
    <div class="modal__content">
      <h3>This is a Modal</h3>
      <p>Maybe it's for a newsletter signup. Or just to say hello. It could be for whatever really..</p>
      <form>
        <input type="text" placeholder="Email">
        <button class="btn">Submit</button>
      </form>
    </div>
  </div>
</div>

.modal__containter {
  position: relative;
  &.modal__open {
    overflow: hidden;
    &:before {
      content: '';
      display: inline-block;
      background: rgba(0,0,0,0.5);
      position: fixed;
      top: -100%;
      bottom: 0;
      left: -100%;
      right: 0;
      z-index: 0;
      height: 200vh;
      width: 200vw;
    }
  }
}

.modal {
  display: block;
  width: 500px;
  margin: 0 auto;
  position: fixed;
  background: white;
  top: 50%;
  left: 0;
  right: 0;
  z-index: 1;
  -webkit-box-shadow: 3px 3px 20px 0px rgba(0,0,0,0.6);
  box-shadow: 3px 3px 20px 0px rgba(0,0,0,0.6);
  opacity: 0;
  transform: translateY(calc(-50% + 100px));
  transition: opacity 0.5s ease, transform 0.6s ease;
  &.visible {
    opacity: 1;
    transform: translateY(-50%); 
    transition: opacity 0.5s ease, transform 0.6s ease;
  }
  &.transition {
    opacity: 0;
    transform: translateY(calc(-50% + 100px));
    transition: opacity 0.5s ease, transform 0.6s ease;
  }
  &.hide {
    display: none;
  }
}
.modal__content {
  padding: 20px 90px;
}
.modal__close {
   display: inline-block;
   position: absolute;
   top: 0;
   right: 0;
   height: 40px;
   width: 40px;
   &:after {
     content: '';
     display: inline-block;
     height: 100%;
     width: 100%;
     position: fixed;
     top: -100%;
     bottom: 0;
     left: -100%;
     right: 0;
     height: 200vh;
     width: 200vw;
     z-index: -1;
   }
 }

$(document).ready(function(){
  
  // Open modal on button click
  $('#modalOpen').on('click', function(){
    $('.modal__containter').addClass('modal__open');
    setTimeout(function(){
      $('.modal').removeClass('hide');
      $('.modal').addClass('transition');
    });
    setTimeout(function(){
      $('.modal').removeClass('transition');
      $('.modal').addClass('visible');
      },50);
  });
  
  // Close moda;
  $('.modal__close').on('click', function(){
    $('.modal__containter').removeClass('modal__open');
    $('.modal').removeClass('visible');
    $('.modal').addClass('transition');
    setTimeout(function(){
      $('.modal').removeClass('transition');
      $('.modal').addClass('hide');
    },500);
  });
  // Close modal with esc key
  $(document).keydown(function(e){
    if(e.keyCode == 27) {
      $('.modal__containter').removeClass('modal__open');
      $('.modal').removeClass('visible');
      $('.modal').addClass('transition');
      setTimeout(function(){
        $('.modal').removeClass('transition');
        $('.modal').addClass('hide');
      },500);
    }
  });
  
});

View it on Code Pen:

http://codepen.io/DinosVsRobots/pen/WRvodR