It you are getting classes right why not add styles on your themes style.css file to handle these ? cause, if you make changes on plugin's style file when you are going to upgrade the plugin you will loose all works !
My theme has nothing to do with this plugin. You need to give me better responses than random one-liners that doesn't solve anything. Please spend a minute giving adequate answers to your support forum guys.
“It’s better to add CSS for the dashboard in your theme.” is not good enough. Please explain a bit further.
If you are trying to adjust the dashboard design and if you are looking for editing the CSS in the plugin, that wouldn't work. As I said earlier, no styles being loaded in the dashboard from the plugin. So even if you would add any CSS to the plugin, that wouldn't work and you would lose the changes you made to the plugin once an update comes. So if you add any styling for the dashboard, add it to your themes style.css, that way it will not be lost when the plugin updates.