Creating a struct of RGB Values

I'm really not sure, but maybe rename "main" to something else?

If you try this code on this website http://codepad.org :

struct RGB {
 uint8_t r;
 uint8_t g;
 uint8_t b;
};

struct BtnCol {
 RGB fill;
 RGB border;
 RGB text;
};

BtnCol main_menu = {{0, 32, 0},{34, 139, 34},{144, 238, 144}};

int main()
{
 printf("%d", (int) main_menu.fill.g);
}

It's working perfectly.