/usr/lib/python2.7/dist-packages/horizon/conf/dash_template/static/dash_name/css/dash_name.css is in python-django-horizon 1:2014.1.5-0ubuntu2.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 | /* Additional CSS for {{ dash_name }}. */
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