Untitled

<!DOCTYPE html>
<html>
<head>
	<title></title>
	<link href="https://cdnjs.cloudflare.com/ajax/libs/jqueryui/1.12.1/jquery-ui.min.css" rel="stylesheet">
	<style type="text/css">
		#draggable{
			width: 100px;
			height: 100px;
			background-color: blue;
		}
		#droppable{
			width: 500px;
			height: 500px;
			background-color: red;
		}
	</style>
</head>
<body>
	<div id="draggable"> </div>
	<div id="droppable"></div>
	 <script src="https://code.jquery.com/jquery-2.2.4.min.js"></script>
    <script src="https://code.jquery.com/ui/1.12.0/jquery-ui.min.js"></script>
	<script type="text/javascript">
	  	$( "#draggable" ).draggable();
	    $( "#droppable" ).droppable({
	    	drop: function( event, ui ) {
	    		alert("droppable");
	  		}
	  	});
	</script>
</body>
</html>