The icon from Bootstrap css file not loaded when offline
<p>I have datetime picker, The problem is no icon appear in the page. But if I disable line (comment out) from local bootstrap.css then add hyperlink bootstrap.css from <a href="http://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.6/css/bootstrap.css" rel="nofollow">http://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.6/css/bootstrap.css</a> its worked perfectly. So why? I want to local css file that I used to offline, I dont want to online css rendering.
Here my code :</p>

<pre><code>    &lt;link href="css/bootstrap.css" rel="stylesheet"/&gt;
    &lt;link href="css/bootstrap-datetimepicker.css" rel="stylesheet"/&gt;

    &lt;script src="js/jquery.js" type="text/javascript"&gt;&lt;/script&gt;
    &lt;script src="js/moment.min.js" type="text/javascript"&gt;&lt;/script&gt;
    &lt;script src="js/bootstrap.js" type="text/javascript"&gt;&lt;/script&gt;
    &lt;script src="js/bootstrap-datetimepicker.min.js" type="text/javascript"&gt;&lt;/script&gt;


&lt;script src="js/bootstrap-datetimepicker.min.js" type="text/javascript"&gt;&lt;/script&gt;
 &lt;title&gt;&lt;/title&gt;
    &lt;/head&gt;
    &lt;body&gt;
        &lt;form id="form1" runat="server"&gt;
        &lt;div class="container"&gt;
        &lt;div class="row"&gt;
            &lt;div class='col-sm-6'&gt;
                &lt;div class="form-group"&gt;
                    &lt;div class='input-group date' id='datetimepicker1'&gt;
                        &lt;input type='text' data-date-format="MM/DD/YYYY HH:mm" class="form-control" /&gt;
                        &lt;span class="input-group-addon"&gt;
                           &lt;span class="glyphicon glyphicon-calendar"&gt;&lt;/span&gt;
                        &lt;/span&gt;
                    &lt;/div&gt;
                &lt;/div&gt;
            &lt;/div&gt;
            &lt;script type="text/javascript"&gt;
                $(function () {
                    $('#datetimepicker1').datetimepicker();
               format : 'MM/DD/YYYY'
                });
            &lt;/script&gt;
        &lt;/div&gt;
    &lt;/div&gt;
        &lt;/form&gt;
    &lt;/body&gt;
    &lt;/html&gt;
</code></pre>

<p>So its work if with this line, </p>

<pre><code>&lt;link href="http://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.6/css/bootstrap.css" rel="stylesheet"/&gt;
</code></pre>

<p>I was downloaded that css then I used for offline but it not working. Please Help
Thank you,</p>