Trying to load background into dashboard from docker

Hello

I am running a docker install of HA on Ubuntu.

I am trying to load a background into my lovelace dashboard. I have the following setup:

In configuration.yaml:

frontend:
javascript_version: latest
themes: !include themes.yaml

In themes.yaml:

title: Home
views:

  • background: center / cover no-repeat url("/local/dashboard_background.jpg") fixed

My background is in:
config/www

The actual directory on my machine is /home/my_user_name/homeassistant/config/www

Any ideas what I am doing wrong? The background won’t show up