GTK+3 config Arch/LXDE

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http://unix.stackexchange.com – I use Arch + LXDE. I performed a full system upgrade and upgraded packages seems to have included GTK+3. Since the upgrade, my GTK+3 progs such as GEdit, Evince, etc. look somehow terrible (unusual padding between button texts and button boundaries, ...) and I don't have the gtkrc in home. pacman -S gtk3 too, can't return the RC file. What should I do? Thanks for helps. (HowTos)