Custom code in button block doesn't look like a button!

Site URL: https://www.leaportho.com/schedule-a-consultation

I am trying to add this custom link into the button so that the button will take the site visitor to the scheduler for my office software.

The office management software gave me this link to use: 

 <a href="https://www.anywheredolphin.com/forms/www.leaportho.com/t2gIDTgZ5E+JxjdOctQavg">New Patient Online Form </a

But, when I put that into the button link, I lose the shape of the button and the display is this:

The word display is active and can be use to schedule an appointment through my management software. Why do I lose the "shape" of the button when I insert that link?

Thanks in advance!

you don't need to paste in the whole code like that. leave all the <a> stuff out, just extract the URL bit and put that in the link. 

https://www.anywheredolphin.com/forms/www.leaportho.com/t2gIDTgZ5E+JxjdOctQavg

Amazing, thank you!