Signature HTML outlook

Is there a way to force outlook to always reply emails as HTML?
Plain text messes up my signature.

In my signature i also have a link to my website, and when the text is editet(example press enter under signatur) the link text turnes blue with underline (typical standard link)
I need to lock my signatur with some sort of CSS with a set value for link proporties.

is there a way to handle this?

Thanks.