Custom style with CKEditor for Joomla

Hi there!

I need help, I do not know what I am doing wrong, but I cannot add my own styles to the dropdown-list.

I wrote my ownstyles.css with this content:

p.fett{
font-weight:bold;
color: #3598fd;
margin-left:15px;
margin-right:15px;
}

p.schief{
font-weight:italic;
color:#73b7ff;
margin-left:15px;
margin-right:15px;
}

I uploaded this file into the styles folder of the ckeditor plugin, and wrote in the field in the advanced tab following:

ownstyles.css

I had only a empty dropdown, so I added it to the css-files too, in the folder and in the field in the advanced tabs.

I am using Joomla 2.5.4 and CKeditor I downloaded few weeks ago from extensions.joomla org, so it should be the actual one?

What am I missing here? I have read all documentation about it and searched the forums, but I have no answer.

Please help somebody