Changing colour of function interface C++

I am using the C language syntax highlighting in atom. I am wondering if there is a way to change the colours of what appears within a function interface…

void f(int I, real d)

Currently, capital I goes as a constant in the syntax group and lower cases like “d” goes under text, which is just white.

Every other variable in the code also goes under text so changing the colour of syntax–text will change everything and not just “d”