Note that KDE also has an login manager called kdm which you maybe want to install instead of gdm if you use KDE instead of Gnome.
best regards Andreas Janssen
GDM is more configurable (at least as far as I know). You can also theme it with a KDE-looking theme (of which there are many).
I suggested KDE since the OP mentioned that he installed the "Desktop Environment" (which gives you GNOME and KDE, IIRC) I figured gdm might be preferrable.
-Roberto
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