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I Want to Center the "Einfache Liste" i dont find the CSS File
Thanks for Help  

Hi, I don't understand what you want, but you can find the css, via backend > css manager. It depends if you use legacy or responsive styles. so it's jem.css or jem-responsive.css.

You could explain your question with help of an example like in the demo:
demo.joomlaeventmanager.net/demo/simplelist-mandatory

Or you give us a link to your live site, where the question comes from.

I think this way it is easier to understand.