I had the same questions. I just looked at https://oohoo.biz/index.php/en/plug-ins/utilities/
Ger: have you ever used One topic?
https://moodle.org/plugins/view/format_onetopic See below, with my testing of the Pioneer theme.
-Derek
Hi Derek,
Did you make any changes to the style.css fro onetopic or is this part of the theme (to get the white bar and the lightblue focus TAB?)
Ger, this was just a bit of CSS added to the theme "Additional CSS" Nothing specific to the onetopic code.
-Derek