Button in Message Template

Hi Eugene ...
I have a problem ...
Is there a way to insert a BUTTON into a message template?
I had no succed in that. The only think I was able to do is write a TEXT as a link but I want to have some button there where my customers can just click in order to reply or to accept a quote with 1 single click ... With text, I did obtain my goal BUT ... it is so ugly!
Thank You.
Pietro