Going through the Bulma.io documentation, I cannot find how to set the base font-size for the responsive design.
As per this section on setting initial variables, we can set the initial value of classes $size-1 etc. However, I am wanting to set the very base font-size for the responsive-design. I.e. when the screen dimensions are, say, 980px, the base font-size should be 12px, instead of the standard 16px. Because the above mentioned font classes '$size-1', are rem, they would automatically resize as well. 
So, my question is, is it possible to set the base font-size for the responsive design in Bulma? Or must I change the sizes of the classes $size-1 etc manually.
Thanks
 
     
    