Hey,
Have performed Browser testing for Cornerstone elements we habe built on our installation.
I found a bug on Ipad Air 2, Safari browswer, for Button element we are using.
Please see following image.

Also find the Button template exported from Cornerstone
http://roomhero.de/wp-content/uploads/buttonbug.tco
As everything in Button is built with Cornerstone, decided to paste it here.
Any suggestion or advice to fix it? 