Plugin is changing my link colors

The plugin comes with own css styles what are affecting my whole design. In the plugin settings there is no option to change or disable that.

Have a look at this archive page: https://www.raeucherwiki.de/category/anleitungen/bauanleitungen/

The links appear blue but should be green.

When plugin is disabled my colors are OK.

Any suggestions?

Best regards
Danyel