在对话框中设置按钮的背景？

I have a dialog, which works just fine for me, but I want to set my background for two buttons in this dialog. The structure of it is quite complicated so I don't want to rewrite it to a custom dialog. But in this case, is there any possibility to set a background(more specifically, is there a way to set a style to positive/negative/neutral buttons)? I have a dialog, which works just fine for me,