Non group color

Is there a code i could put in css that makes all non group members 1 certain color? because i want all members green, but i dont want to create a group

I personally haven't found a way to do this, but what I've done (and I know you said you'd prefer not to) was made a group that people are automatically added to after x amount of posts. For me it was to seperate the inactive members from the active members so I could see that so & so has x amount of posts at least so leave that account alone, vs this newbie who joined 3 months ago and has 2 posts.. yknow?

Just make a members group. It takes 2 seconds...

Im not sure if you read my first post, i said without making a group. i want a css code, where i can personally change name colors