Change color of Siri's Wolfram Alpha responses?

[ejbSF]

When I ask Siri for "tide charts san francisco" or "when is the sunset" the reply coming from Wolfram Alpha is always in black with dark blue/green/red lettering. Unfortunately, I can't see that outdoors, which is where I usually am when asking such questions.

How do I get the replies on a white background (or other light color)?

Thanks for any help,
Ed

Forgot to mention: iOS7 on a 16gb iPhone 4s