To create a little card for rules of usages for a platform

I built this website, and I need to make a little card appear at the beginning, it has an X symbol at the top right to close it, and I want to put a text on it explaining some rules.
I don’t know how to call it so my google searches have failed.
little help, please?
thank you

Do you mean a modal?

If so you can check out the dialog element as it’s fairly easy to use.

perfect thank you///////////

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