Traefik & Keycloak setup for Website Auth

I've got Traefik running fine. I've got Keycloak running. I've got plenty of other docker containers running (all in Portainer except for the Traefik/Portainer container). What I cannot seem to figure out is how to setup a container so that it does an authentication against Keycloak before allowing you to go to the site. Should be easy right?!?!?