Phone number color on mobile phone

I have been unable to not have the color of the phone number in the purple boxes on this page ( https://www.ardenwood.org/ ) turn the same color as the box and not be white. This only happens on my iPhone. I have inserted many CSS code options, span tags and alternate modules, to try and override what the phone display is doing, but nothing works. I want the phone number in the colored info boxes to be white on all device screens. Thanks for the assistance, it is appreciated.