IE text color

[required_username]

Hope this is the proper forum. IE 11


I have set text colors in Tools>Internet Options>General>Colors. For reason I don't understand, some web sites use the colors I specify - some don't. With "Use Windows colors " checked, some web sites display background images - some don't. Some dropdown menus show a grey background and black text. Some show a black background and white text. Even the color boxes in Tools>Internet Options>General>Colors will show colors or grey boxes, depending on whether "Use Windows colors" is checked or not.
How do I get all web sites to use the colors I select?