I tried it in a code block and the button didn’t display, you can see the results on the screenshot. Maybe you can try on the page?
The button on there now is just a temporary fix, the code i provided earlier is what I want it to be.
Now running enfold 3.3.2 and wordpress 4.3.1
I put a button there that links to an external page temporarily. The problem was that the button was not displaying and javascript widget would not display on the page or pop up.
provided
https://www.dropbox.com/s/5efmk9u8q0kw572/Screen%20Shot%202015-10-02%20at%2010.07.48%20am.jpg?dl=0
running the single page restaurant theme enfold