footer newsletter signup text input – change color

Hi,

Put in a signup form for the footer
– but the text input field types in as white on a white background when typing in
– but then shows what you have typed in black once you move out of it.

I need it to show as black when people are typing – so you can see what you are typing.

Website is: https://mindbodytherapist.com.au/
& it is the ‘Signup to recieve updates’ widget in the footer.

Thankyou,
Ken