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You will need to inject custom CSS to change the background.
To remove the background, inject the ff code:
background: none !important;
To change the color, use the ff code - replace the underlined color code to suit your preference:
background-color: #ffffff !important;
For more color codes, http://html-color-codes.com/
Here's another article for customizing your form via CSS code injection:
Hope this helps.