How to set "Author" class for Generateblocks

Hi there,

This <div class="gb-inside-container"> is part of the GenerateBlocks container block, and that class is required.
What is the purpose of adding the author-box class ?

Hi

Just to inform google bot that it's an author box.

SEO purpose

Adding the class won't mean anything to google bot or other search engines.
If you want Google to know who the author of a post is, then you should add it with JSON-LD which is Googles preferred schema.
Most SEO plugins do this for you, and can add the author property within their article schema.