Responsive format of buttons

Hello Sakin I've formatted some links to look like buttons, which works great until I go on my mobile. The responsive part of the theme kicks in and reformats the buttons - which is good except I can't find where the responsive css for buttons is stored so I can't copy it for my fake buttons. (I looked in the file responsive.css but only saw a change in text size, whereas the buttons padding and shape are changing too). Please can you point me to where the relevant css is to be found? Thanks, Ronel