How to change the colour of the Contact Us "Success Message" ?

How to change the colour of the Contact Us "Success Message" ?

Hi, 

On our site... ( http://www.perfectbooks.eu/contact.html) , we have an issue with the "Success Message" that appears after the user hits the Submit button on the Contact Us form.  The message that is flashed up, is almost exactly the same colour as the background colour of the page.  It is almost impossible to see and makes users think that the Submit Button doesn't work. 

I'm guessing that I need to change a Color code in the HTML & CSS editor, but I can't see which line to change. 

Any help would be greatly appreciated. 

Many thanks

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