How to set back ground color to a textfield

Here I'm trying to create a textfield as disabled with background
color as a red/green!
i can able to make it as a disabled but color doesn't rendering in
browser...
i'm using

textfield.setStyleAttribute("backgroundColor","green"); method but
it's not rendering into browser !

any idea about this kind of issue .

Thanks in advance

Vijay Katta

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