Continue reading button in article

Hello,
I saw in some sites a button that is only visible in the article, which appears after the first paragraph and that when clicked by the visitor expands the rest of the article.

In practice it is somewhat similar to seeing more of the wordpress only than just in the article. You can see the example here.

So I have this looking and I can not find anything similar, I do not want to put it on the home page, just inside the article.

Does anyone know anything that can do this?