Send as webpage - newsletter is frozen on macOS Mail.app, cannot scroll down

You can try for yourself.

Try to send this URL as webpage: https://katkay.com/newsletter-5/

Send that and read using Mail.app on macOS.

You see the top part of the webpage but you cannot scroll down.

Something like:

You can visit the original URL and you will see it works perfectly.

I can post the email source code if you want.

Thanks.