Seems like a stupid question...

I cannot seem to override the fact that, in html, *some* form elements of type="text" default to a yellow background. I have tried to force a non-yellowed out background, but it still shows up on form elements like phone, email, name, etc. Is this some kind of browser-specific mark-up that resists styles?

I have tried setting the background-color attribute in the style for the input tag as well as a self-defined style called .nonyellowbox - neither have been successful. Help?