@media (min-width:321px) and (max-width:640px){
    [class*="-small-5"]>*{width:calc(100% * 1 / 5 - 2rem - .01px)}
    [class*="-small-6"]>*{width:calc(100% * 1 / 6 - 2rem - .01px)}
    [class*="-small-7"]>*{width:calc(100% * 1 / 7 - 2rem - .01px)}
    [class*="-small-8"]>*{width:calc(100% * 1 / 8 - 2rem - .01px)}
    [class*="-small-9"]>*{width:calc(100% * 1 / 9 - 2rem - .01px)}
    [class*="-small-10"]>*{width:calc(100% * 1 / 10 - 2rem - .01px)}
    [class*="-small-11"]>*{width:calc(100% * 1 / 11 - 2rem - .01px)}
    [class*="-small-12"]>*{width:calc(100% * 1 / 12 - 2rem - .01px)}
}