Different name colors for admins and guests

Hi,

I have the cubrick theme (default wp) and I want to ad some changes. I want the admin name, registrated users name, moderators names and guest names to all have different colors.

So like;
Admin name = red
registrated names = blue
guest names = orange
moderator names = green

etc…

How to do this? Perhaps using the color of a user depents on his level?…

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