How to fix validation error "The frameborder attribute on the iframe element is obsolete. Use CSS instead"?

Question

reCAPTCHA

There is a site on Joomla and Wordpress. Validation errors need to be fixed. Fixed almost everything except 2 errors:
1) The frameborder attribute on the iframe element is obsolete. Use CSS instead.
2) No p element in scope but ap end tag seen.
Both errors are due to reCaptcha.
And reCaptcha is called in: Wordpress - Contact Form 7, Joomla - RSForm Pro.
How can these errors be corrected?
Validator link:
https://validator.w3.org/nu/?doc=http%3A%2F%2Fkupi...