message: fix(core): check id_tokens according to base64url instead of base64
diff: @@ -29,7 +29,8 @@ import { InfoCard } from '../InfoCard/InfoCard';
  import { ProviderComponent, ProviderLoader, SignInProvider } from './types';
  import { GridItem } from './styles';
  -const ID_TOKEN_REGEX = /^[a-z0-9+/]+\.[a-z0-9+/]+\.[a-z0-9+/]+$/i;
  +// accept base64url format according to RFC7515 (https://tools.ietf.org/html/rfc7515#section-3)
  +const ID_TOKEN_REGEX = /^[a-z0-9_\-]+\.[a-z0-9_\-]+\.[a-z0-9_\-]+$/i;
  const useFormStyles = makeStyles(theme => ({
  form: {
  