CSS problem "error" with the new backend

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Hi,

the instructions / rules in the external style sheet:

# footer a {color: # fff; text-decoration: none;}
# footer a: before {content: "\ 00BB" "";}

, cause that affects the upper navigation bar of the new (5.5.1) BACKEND area by these rules - will be shown "wrong"!

Is this a bug? And what can I do about it?

Thanks for the help here! I had earlier with other sites, however minor problems - affect the CSS rules for the site and the backend!

LG uli