Best main text, font-size for responsive css design ?

[marios.frag]

Hello to all!
My last sites, have been designed with responsive css. I make use of media queries.
When I check them in some smart phones, the text was not very readable, due to font-size.

I normal use 12-13px font-size for the main text
. I think that is not a good approach. What is the best font-size for all ???
In percentage (%) or in ems. And what size ??

[johnwest]

If you follow any pre-defined frame work then it will be easy for you. Try bootstrap, semantic, foundation 3. For bootstrap frame work please find the reference: http://getbootstrap.com/

[marios.frag]

What if i dont use a pre-defined framework ?
I dont use bootstrap, but custom html/css.

What is best for em or pixels in this case?

[cutegirl]

You should define such size differently for different gadgets.

[StuartSpindlow1]

12-13px is good in my opinion.