Edit responsiveness

Hi,

I really love the Pachyderm theme! I have one problem though: The theme is responsive and looks beautiful from a mobile phone but not so god when surfing from a tablet. I want it to be possible for visitors to see the sidebar/-s when surfing from a tablet. Is it possible to remove the responsiveness for tablets? I mean, to make the theme responsive only when the screen is as small as a smartphones?

Regards,
Jessica