Filament base address setting?

I have set up laravel, livewire, and filament on github codespaces. things are mostly working.

However, when I visit the /admin page created by Filament the styling is off because it tries to get its CSS from an address of //localhost, whereas my site is on a Codespaces-generated address. I have changed .env's APP_URL to reflect the correct address, but the CSS source address doesn't change.

How do i tell Filament the domain to use as its base?
Solution
I tried adding an ASSET_URL, but this didn't help.
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