How to Make Buddypress Sliding Login Panel - Mobile Friendly

Hi

I am trying to view buddypress sliding login panel on a mobile.

I have it so that people cant scroll to the right on my site.

Because sliding login panel is a fixed width of 900+ pixels my mobile does not see it all - and the user cannot login.

How can I code it so the 3 columns within buddypress sliding login panel adjust when on mobile?

Cheers

Johnny