Example URL:
https://www.zuckerstein.cz/en

Steps to reproduce the problem:
1. visit website https://www.zuckerstein.cz/en and scroll down to see some "Learn more" button
2. do a long press on this "Learn more" button

What is the expected behavior?
The button should change its color to dark blue from middle to left and right hand side without exceeding the button area.

What went wrong?
The dark blue part exceeds button area.

Does it occur on multiple sites: N/A

Is it a problem with a plugin? No 

Did this work before? N/A 

Does this work in other browsers? Yes

Chrome version: 58.0.3029.83  Channel: stable
OS Version: 7.1.2
Flash Version: 

The interesting thing is that this button hover/press effect works properly on the same page in the top slider (labeled as Contact) and as HTML button "Send" in contact form at the bottom of the page. The only difference is that those Learn more buttons have on desktop resolution position absolute & bottom 30px which is in later CSS reset back to position static for smaller screens. Adding bottom: auto doesn´t help.
On Windows and latest stable Chrome / Firefox / Edge it works properly everywhere.