To change the color of the menu text you will need to add this to your css: (you will want to change the color code to whatever you want)
.top-navigation .horisontal-navigation li a {color: #000;}
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To change the background color of the menu you will want to add this to your css: (again changing the color code)
.top-navigation {background-color: #fff;}
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I can not seem to figure out how to center align the menu, but you could try this work around — Add some padding (you will want to adjust these numbers up or down slightly to make it work for your menu). You would add this along with the text color change. So it would look like this:
.top-navigation .horisontal-navigation li a {color: #000; padding: 15px 15px;}
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Hope that helps!
