Buttons not effectively mobile responsive

I have noticed that the buttons on my page (http://ventamsystems.net/wp/about/) ‘find out more’ and ‘contact us’ when the page window gets smaller to a mobile version, the buttons move above and below each other, but not centred nicely. It might have something to do with each button being right adjusted and left adjusted respectively, hence why they look like this on a mobile/smaller device, but is there any other way to make the buttons next to each other on the page but still keep them in the centre on the mobile version? Thanks.