Change user color

Hello BBPRESS advanced statistics community,

I really want to change color of my usergroups in my forum made by bbpress.
I have the standard role (keymaster, moderator, blocked ecc) but with names modified by editing the file functions.php in my theme folder.

Now I would like to change the color in the status bar and in the topic/threads, example Administrator in the red, moderators in blue ecc.
I tried a insert this code in bbpress/templates/default/css/bbpress.css:

.bbp-author-role-keymaster {
background:red;
color:red;
padding:0 5px;
}

but it does not change anything, why?
I want to change color here

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