Updte 'simple' example to use Bootstrap 3.

examples/simple/app.py

@@ -30,7 +30,7 @@ def index():
     return '<a href="/admin/">Click me to get to Admin!</a>'
 
 # Create admin interface
-admin = admin.Admin(name="Example: Simple Views")
+admin = admin.Admin(name="Example: Simple Views", template_mode='bootstrap3')
 admin.add_view(MyAdminView(name="view1", category='Test'))
 admin.add_view(AnotherAdminView(name="view2", category='Test'))
 admin.init_app(app)

examples/simple/templates/admin/index.html

 {% extends 'admin/master.html' %}
 {% block body %}
 {{ super() }}
-<div class="row">
-  <div class="span10 offset1">
+<div class="container">
+    <div class="row">
+        <div class="col-sm-10 col-sm-offset-1">
             <h1>Flask-Admin example</h1>
             <p class="lead">
                 Simple admin views, not related to models.
@@ -14,7 +15,8 @@
             <p>
                 By adding custom views to the admin interface, they become accessible through the <em>navbar</em> at the top.
             </p>
-    <a class="btn btn-primary" href="/"><i class="icon-arrow-left icon-white"></i> Back</a>
+            <a class="btn btn-primary" href="/"><i class="glyphicon glyphicon-chevron-left"></i> Back</a>
+        </div>
     </div>
 </div>
 {% endblock body %}