animated signature

[Sinistria]

Hi,
i saw some animated signature and i read something it is allowed or not.
But still, there are some animated ones.
Can anybody tell me what to type in the signature around the link from the hoster that it becomes visible?

like:

[IMG]_https://imgur.com/a/31XioFQ_[/IMG]

but that one won't work. (underlines are in just to make the text visible)

Thank you very much.