How set default wallpaper in chroot

Hi.Due to I need make my Fedora Live CD.So I need set default wallpaper in chroot,but after I set default wallpaper in chroot.My set default wallpaper isn’t to applied.What Should I do?

Custom default values for system settings

Thank you.I have another problem.I want to enable extensions in chroot.What should I do?

sudo tee -a /etc/dconf/db/local.d/00-local << EOF > /dev/null
[org/gnome/shell]
enabled-extensions=['GPaste@gnome-shell-extensions.gnome.org', \
'user-theme@gnome-shell-extensions.gcampax.github.com']
EOF
sudo dconf update

ok.I find some time try it.I have another problem.How change GNOME 47’s Accent Color in chroot.

You can find the relevant dconf paths like this:
Changing a couple things in GDM - #2 by vgaetera

Hello.I tried it.I configured some dconf profiles and I running “dconf update” the command in the chroot.And I after repackaged ISO image.During test on VM.The VM prompt I have to regenerate initramfs.What should I do?
“March7th-Arc” is my use livemedia-creator created an ISO image.