CefSettings.background_color and CefBrowserSettings.background_color both not work on ver 129 130 131

[matakk]

I have build and test x64 versione of 129,130,131,
I use a sample webpage , ver111 is work fine.

my code is like this:
CefSettings cSettings;
CefSettingsTraits::init( &cSettings);
cSettings.multi_threaded_message_loop = true;
cSettings.no_sandbox = 1;
cSettings.background_color = CefColorSetARGB(0xff, GetRValue(crBackGround), GetGValue(crBackGround), GetBValue(crBackGround));

CefBrowserSettings browserSettings;
browserSettings.webgl = STATE_ENABLED;
browserSettings.background_color = CefColorSetARGB(0xff, 255, 0, 0);

the webpage background color is always white.
how to change the backgournd clolr
thanks!!!