Confusion over data structure binding?

Code 1: -

struct emp
{
  char a;
  double b;
};
int main()
{
    struct emp e;
    printf("%p    %p", (void*)&e.a, (void*)&e.b);
}

Output on my computer: -

OO28FF00    0028FF08

Since size charand doubleis equal to '1' and '8' respectively, and therefore, 0028FF00and 0028FF08are multiples of "1" and "8" respectively.

Code 2: -

struct emp
{
  char a;
  long double b;
};
int main()
{
    struct emp e;
    printf("%p    %p    \n", (void*)&e.a,(void*)&e.b);
}

Output: -

0028FF00    0028FF04

Since the size charand long doubleis equal to '1' and '12', respectively, but 0028FF04not a multiple of "12".

Why is the supplement not applicable in this case?