Prestashop E-Commerce Themes on Mobile Device

hi, I am running business about themes for prestashop <snip/>. Currently I have nearly 4-5 templates. I am not handy with mobile device compatible css. If I could design for mobile too, that would be more better for my members. But still I have do not have enough knowledge about mobile device compatibility. Is there any technique/software/idea ? So that I can make compatible my themes on mobile devices

Thanks for reading and waiting of your solution. :smiley:

Regards
Devil Themes