Hi,
for the list CB is using standard classes. You have 2 options:
1. Creating a template override and give the table different class names and specify custom css for these classes
Please read this short sample:
crosstec.org/en/forums/37-contentbuilder...-listview.html#65503
2. Using a theming plugin and override all the relevant CSS for the existing classes, but adding an !important after each CSS style, so it cannot be overriden by Yootheme. For example:
.cbListView category { border: 20px !important; }
Both approaches will have a similiar work load but by both you can keep yootheme away from styling your tables.
Regards,
Markus