jQuery draggable is not working within a particular div

I’m trying to create a draggable div with jQueryUI & Bootstrap. I have created the draggable div, But if drop the draggable div in another div, It is no longer movable. (the second div is not a droppaable one.)

<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
    <link ="assets/css/bootstrap.min.css" rel="stylesheet" media="all">
    <link ="assets/css/custom.css" rel="stylesheet" media="all">
    <script type="text/javascript" src="assets/js/jquery-2.1.3.min.js"></script>
    <script type="text/javascript" src="assets/js/jquery-ui.min.js"></script>
    <script type="text/javascript" src="assets/js/bootstrap.min.js"></script>
</head>
<body>

    <div class="content">

        <div class="row"></div>

            <div class="draggable-divs col-md-12">
                <div class="elem col-md-1">
                    <a ="#"><span class="glyphicon glyphicon-move pull-right"></span></a>
                    FILL
                </div>

                <div class="elem col-md-1">
                    <a ="#"><span class="glyphicon glyphicon-move pull-right"></span></a>
                    FILL
                </div>
            </div>

        <div class="row">
            <div class="drop col-md-12">
                Drop Me Here
            </div>
        </div>

    </div>

    <script>
        $(document).ready(
                function(){

                    $('.elem').draggable(
                            { appendTo: 'body' }
                    );

                }
        );
    </script>
</body>
</html>

Can anyone help me out here?


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