Add custom css classes

jenbrueske → changed the visibility of the branch 3407069-add-custom-css to hidden.

jenbrueske → changed the visibility of the branch 3407069-add-custom-css to hidden.

jenbrueske → changed the visibility of the branch 3407069-add-custom-css to active.

I'm not sure If I pushed this correctly to the branch, please let me know!

Added custom classes to the container configuration.

Thanks!