Print button hover color – CSS

Hi there!

I use a recipe card that comes with the Kindred child theme under Genesis: link here.

Here’s an example of a recipe card – scroll to the bottom of the post http://www.shiumaieats.com/2015/08/healthy-quinoa-salad-with-sesame-crusted-salmon-tahini-dressing/

I’m having a styling or CSS issue with the PRINT BUTTON. When I hover, the button turns white and since the text “print” is also white, the button just looks like it disappears. Where in the CSS code do I edit to change the hover background color?

ANY help is greatly appreciated! Thank you so much.