iframe auto height

Dear Members, coulde you please tell how to make iframe automatically expand to the height of the content. I have a news block with some news that have "read more" button. I need the iframe to change the height to the content that expands or collapses without scrollbars. Tried to look through the internet, nothing works. Please help.

I'm going to refer you once again to the post you created about containers. The answers are pretty much the same: https://bootstrapstudio.io/forums/topic/question-about-containers-and-just-elements/