Dark theme

User Support General
4 
[user@dom0 ~]$ echo "QT_QPA_PLATFORMTHEME=gtk2" | sudo tee -a /etc/environment

You’ve also missed a whole section that’s mentioned in the comments:

[user@dom0 ~]$ cat << EOF > $HOME/.gtkrc-2.0 
include "/usr/share/themes/Arc-Dark/gtk-2.0/gtkrc"
style "user-font" 
{
        font_name="DejaVu Sans Book"
}
widget_class "*" style "user-font"
gtk-font-name="DejaVu Sans Book 12"
gtk-theme-name="Arc-Dark"
gtk-icon-theme-name="gnome"
EOF

[user@dom0 ~]$ mkdir -p $HOME/.config/gtk-3.0
[user@dom0 ~]$ cat << EOF > $HOME/.config/gtk-3.0/settings.ini 
[Settings]
gtk-font-name=DejaVu Sans Book 12
gtk-theme-name=Arc-Dark
gtk-icon-theme-name=gnome
EOF

Then logout/reboot.

That guide lists precisely everything you need to do.
What exactly are you having trouble with?

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