Hey Anthony
I got your issue. You have set background color with transparent so when you set the same color on then color getting dark because of their own background and background color of the parent( which is also transparent).
So you using the normal color (like red, green and any) then it will look the same as you want but in case of transparent it gets the change because of double background (own and their container)
Use this color :
Background container : rgba(0, 0, 0, 0.5)
Inner Container Colour : rgba(0, 0, 0, 0); // this will become 100% transparent so that container background will look here
menu item : rgba(0, 0, 0, 0);
I hope it will solve and if you still have any issue then, please send the color that you want exactly for mentioned above.
Regards,
Suraj