Pagination buttons are overlapping on phones

Hello there,

Hope you have an amazing day

My buttons for my appointment+ (of next week, previous week) are overlapping on smaller screens. See attached screenshot:
Clearly, I've been playing with the design of the buttons.

I have the shortcode: [app_pagination anchors="0"]. You could see this on: http://koalatutor.ca/a-koala-tutor/?wcalendar=1452356844

I'm using the latest version of Divi.