How to decorate external links with only CSS one line

When reading online, Iā€™m a little reluctant to click if there are links to other sites. If the post is short, I read the post and open it separately, or if the post is long, I open it with a new tab in the middle. In this case, how about marking the external link nicely? There is a really simple way to display external links with just one line of CSS.

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