Hello,
Thanks for reaching out! The team took a look for you on a test site and came up with the following suggestion. First, a custom class "buttonize-ffl-style" was added:

Then, you would want to add the following style to your site css:
.buttonize-ffl-style{ line-height: normal;}
Here is the button before the style was added:

And here is the button after the style is added:

Hope that helps!