see comments by Parent5446 on PatchSet 61
https://gerrit.wikimedia.org/r/#/c/55287/61/OpenID.hooks.php
"You're gonna want to avoid inline CSS at all costs. Rather than putting an inline style, instead have a CSS file for each provider. That way when MediaWiki eventually becomes CSP-compatible E:OpenID can work with it."
E:OpenID still uses a few lines of inline CSS. This should be fixed,
Version: unspecified
Severity: normal