> is set, the announcement will close
automatically after the specified time (in seconds). The user can close
the announcement earlier if they desire.</li>
<li>If <code>auto_close</code> parameter in configuration file is blank,
the announcement will only be closed manually by the user clicking on
the X in the top right corner.</li>
<li>Start and End dates can be set optionally. If unset the banner will
always be shown</li>
<li>Styling according to basic bootstrap styles can be specified,
changing the color