Update fields.css to use new classes for fields in core

In Zen 7.x-3.x-dev (2011-02-25) the section in fields.css reads:

.field-field-FIELDNAME /* Underscores in field name are replaced with dashes. */ {
}

Trying a lot of styling with custom created fields which didn't work I looked for a solution in other themes and the Drupal 7 core module css's.

I've figured out, that the field-name should be field-name-FIELDNAME instead of field-field-FIELDNAME, but I'm not sure if this is correct for future development of Zen for Drupal 7.

Here is what I found out working:

.field-name-FIELDNAME  { /*Underscores in field name are replaced with dashes.*/
}

So please have a look at this.

Thanks!