You may design your own content blocks!
For that, just go to the Content Blocks section, then click on the "+" button.

As soon as you've created one, click on save. They can't be published, however, you may use them while creating a page.

In order to find your newly created content block go to the Content Blocks section and check it there.

Blocks help you to build pages faster and use them across different pages. 

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