How to replicate this greenish box from the Release notes v1.0.0 that showed up after update?

After updating to the latest version which is v1.0.0, a new tab called “Release notes v1.0.0” showed up. It look like there is no way to display its markdown code to see what lay beneath.
I’m reaching you to see how to replicate this greenish box in my notes.

This is the box:

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This, I think …

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Thanks, it look like it was [!tip] callout, the non existed icon tripped me off.
Which I don’t know how they hide it, maybe the release notes page was part of obsidian instead of a separate markdown file, therefor rendered differently. also the same reason why there is no source mode to display the markdown.