linx-server/templates/display/pdf.html

{% extends "base.html" %}

{% block main %}
<object class="display-pdf" data="{{ sitepath }}selif/{{ filename }}" type="application/pdf">

<p>It appears your Web browser is not configured to display PDF files. 
No worries, just <a href="{{ sitepath }}selif/{{ filename }}">click here to download the PDF file.</a></p>

</object>
{% endblock %}