The class ".oultine" creates the initial text outline and makes it white.
.text-me is used to style the other HTML block inside the Large Footer Link that makes it work.
this is the simple line of code that makes it work. just replace the phone number with your number and it will bring up the users default messaging app. Pretty neat eh?
The styles come from the class in the HTML above. In the example it's called large-menu-header so just be sure to have a div with that class styled in your stylesheet or somewhere on your site.
Change the code at the end of the Text Me code.