Is it possible to define a background url in the main UI?

I’m wanting to set up a theme that applies background-url to the div with the id view (the main area in the interface, Like seen. I can change the background with the chrome dev tools by adding the css lines, but I have no idea how to tell home assistant to actually add this to the page’s css.

It won’t be that image specifically, just did that for experimental reasons. The actual image will be saved to my www folder and not be a crappy stock photo :wink:

I really haven’t used Lovelace, but apparently it can do this:

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