think, because the given URL of the CSS file doesn't have any complete parameters after query
Try to complete the parameter <link rel="stylesheet" href="-/static/app.css?(whatever you want that shows a css file)">
404 errors are rendered by looking for a template from ["404.html", "500.html"].
404.html doesn't actually ship with Datasette (plugins or custom template directories can provide it). So the 500.html template is used.
That template extends base.html, which expects there to be base_url and app_css_hash variables. But as you can see in the excerpt above, those variables are not being passed to the template context when the error page is rendered.
The HTML starts like this:
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