Add custom 404.

app.py

@@ -84,5 +84,9 @@ def set_style(style):
         abort(404)
     return "", 204
 
+@app.errorhandler(404)
+def page_not_found(err):
+    return render_template("404.mako"), 404
+
 if __name__ == "__main__":
     app.run(debug=True, port=8080)

templates/404.mako

@@ -0,0 +1,6 @@
+<%inherit file="_base.mako"/>
+<%block name="title">
+    404 &ndash; ${g.config.get("corp.name") | h}
+</%block>
+<h1>Error 404</h1>
+<p>The page you asked for couldn't be found.</p>