The last line of the okta-sign-in.min.css file is:
/*# sourceMappingURL=okta-sign-in.css.map */
Loading the CSS for okta-signin-widget from the CDN using:
<link rel=stylesheet href=https://global.oktacdn.com/okta-signin-widget/4.0.0/css/okta-sign-in.min.css>
Results in a 404 error:
DevTools failed to load SourceMap: Could not load content for https://global.oktacdn.com/okta-signin-widget/4.0.0/css/okta-sign-in.css.map: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE