creating transparent window 32 bit color schemes

[se21]

Hi,

I'm trying to create a window with transparent background using CEF3 in Windows 7. I have done the following steps.

1.CreateWindowEx with "WS_EX_LAYERED"
2. DwmExtendFrameIntoClientArea(hWnd,&margins); (margins ={-1})
2.info.SetTransparentPainting(TRUE);
3.SetLayeredWindowAttributes(hWnd, RGB(255,0,0), 254, LWA_ALPHA | LWA_COLORKEY);<trying to make only red color into transparent>

This works fine if I test it on machine which has 16-bit color schemes. But I want to get this working on a 32-bit color scheme machine.
Can you please help me out to achieve that??