How do I make a large clickable submit button.

Hi.. Can anyone please tell me how i would create a box like the following . to go in my right side bar . I assumed that I would place an appropriate script into one of the Text/HTML widgets that is in my Real Estate theme.. it would need to be clickable to take users to the Listing Packages page.. and of course as I am using the responsive theme.. would need to also be scalable/responsive – is that the term??

I have tried using some of the online button creators but cant seem to get it to work for me. OK I am a novice…