Howto - Change the way links are displayed in certain regions

Theme files are in sites/all/themes/themename.

Normally all css changes which effect the look of the page have to be done in the style.css of the theme.

The problem that we had was the way how links are displayed and further more their appeareance should be different in some types of content.

In css you can define the way something is displayed very easy and to distinguish between the content type is possible by classes.