JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://code.jquery.com/jquery-3.2.1.min.js"></script>
<div class="janela">

</div>

CSS

.janela{
  width: 100px;
  height: 100px;
  border:1px solid #f00;
  margin-top: -90px;
  position:fixed;
}

JavaScript

$(function(){
alert($(".janela").css('margin-top'));
  $(".janela").click(function() {
  	var pos = parseInt($(this).css('margin-top').replace("px", ""));
		if(pos == 0){
    	$(this).animate({
        marginTop: -90
      }, 1500 );
    }else{
      $(this).animate({
        marginTop: 0
      }, 1500 );
    }
  });
});