how to embeed react app in iframe in salesforce webchat

Not able for this getting: Refused to display ‘https://yourdomain.com’ in a frame because it set ‘X-Frame-Options’ to ‘sameorigin’.

but alredy added ngnix domain.

I am trying to embeed react based html in iframe to load webchat in salesforce webchat. but getting error while loadign the script tag.

but already that url in cors & trusted url section.