Disqus integration guide inconsistency

I follow Disqus integration guide Official Ghost + Disqus Integration
There is outdated info in the guide, I think, because there is no such classes in the post.hbs file. I can’t pass p.2

I solve it myself but I am not sure it is proper way to setup.
The proper style and pace for Disqus section reached when I past the code snippet in <section class="gh-content gh-canvas"> section of Casper theme.

Ghost-CLI version: 1.23.0
Ghost version: 5.13.2