index.html

<!doctype html>
<html class="no-js" lang="">
    <head>
        <meta charset="utf-8">
        <meta http-equiv="x-ua-compatible" content="ie=edge">
        <title></title>
        <meta name="description" content="">
        <meta name="viewport" content="width=device-width, initial-scale=1">

        <link rel="stylesheet" href="app.css">
        <script src="nickable.js"></script>
    </head>
    <body>
        <div class="draggable">
        	<div class="drag-obj"></div>
        </div>

		<div class="draggable">
        	<div class="drag-obj"></div>
        </div>

		<div class="nickable" id="nickdrop"></div>

        <script>
        	window.onload = function(){
        		var nick = new Nickable('#nickdrop', {
        			bounds: true,
        			allow: '.drag-obj',
        			maintain_position: true
        		}).init();

        	}
        </script>
    </body>
</html>