As mentioned in discord I would recommend adding the following to your k3s deployment. I see multiple pages about the k3s deployment and each are missing the following which will make sure the nodes stay alive even if you over provision pods.

INSTALL_K3S_EXEC= ........ --kubelet-arg system-reserved=cpu=100m,memory=100Mi --kubelet-arg kube-reserved=cpu=200m,memory=400Mi

Details

DEX is installed using pre-existing themes that are available, namely coreos and tectonic.

source: https://github.com/dexidp/dex/tree/master/web/themes

To use a custom theme you need just to put it along with others into a web directory. The folder structure should be the same: logo, favicon, and CSS.

After that, add

frontend:
   theme: yourthemefolder

to