Customizing a Block's Appearance

Are there more pages to read? This How-To seems to focus on preparing to customize a block's appearance rather than actually doing the customization. I did not find any "next page" links off the article. Thanks.

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okapi replied on at Permalink Reply
Well, this article just describes where to find the files for custom templates. This is an overview of the structure of block templates. I find that helpful. For me, there is not much more information to expect.