BBPress iframe does not responsive on mobile device.

[upadalavipul]

I have reviewed many pages on mobile devices and found the iframe does not responsive. Please check below all the attached a screenshot for more understanding.

Also, check the below all pages.

Screenshot: ​https://share.cleanshot.com/qLrmkKRqXPRB9YP1xL4W
Pages:

• ​https://bbpress.org/forums/topic/bbpress-2-6-5-is-out/
• ​https://bbpress.org/forums/topic/before-posting/
• ​https://bbpress.org/forums/topic/bbpress-2-6-6/

[nidhidhandhukiya]

I have checked the given patch, the css is fine but it will not work for all the given pages if we use the iframe with the class name so i have added the different patch.