How to insert a highlighted box

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Hello.

I am using the classic editor because it is easier for me to write articles that way. I am looking for a plugin solution, or something else, that will help me generate the following:

1. On every post that I make, I would like to automatically insert a disclaimer like this one:

​

2. By using some sort of code, like <table> Some Text Here </table> to be able to generate the following anywhere in my post:

&#x200B;

Thanks

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