[major] upgrade to bootstrap 3
diff --git a/website/templates/html/web_page.html b/website/templates/html/web_page.html
index 4711e58..c857263 100644
--- a/website/templates/html/web_page.html
+++ b/website/templates/html/web_page.html
@@ -7,7 +7,7 @@
 {% endblock %}
 
 {% block content %}
-<div class="col col-lg-12" style="margin-top: 15px;">
+<div class="col-md-12" style="margin-top: 15px;">
 	{% include "app/website/templates/html/slideshow.html" %}
 	{{ main_section }}
 </div>