Hi Klap-in,
I tried all that, just nothing.
All I have in my userstyle.css is:
body {
background-color:red;
}
div#panel {
width:20em;
}
div#left-navigation {
left:20em;
}
div#content {
margin-left:20em;
}
The red background is just an attempt to make something obvious happen. Nothing happens. The file is chmod 775 so I don't think anything wrong there.