Add page footer

page.html

 {% extends "templates/page.html" %}
 
 {% block footer %}
-<div class="container text-center">
+<div class="container text-center" style="position: absolute; bottom: 0;">
     <hr>
     <p>This JupyterHub is provided by the ITS and ATI at California State Univeristy San Bernardino</p>
 </div>