Ok, so the first one didn’t worked out, adding it to admin/collapse-style.css
Regarding point nr 2….where should this admin.css file be? I’ve searched inside wp-includes / css and tried adding the class to a bunch of css files but didn’t happen
(editor.css and the folder also contains some other files for the wp bar, i have added the class to every css file there)
P.s. not using any cache plugins and cleard everything in chrome and firefox
Thank you for your fast response Baden!