How to resolve text color conflict on Astreas.co's header page?

Technical Q&A
1

The site is Astreas.co On the email signup form, the box and text are both white. If I change the text color in the theme, it changes the rest of the white text on the page (which has a black background, so needs to remain white)

Any help here would be greatly appreciated!

2

Hello,
Add this css at the bottom of
Online Store->Theme->Edit code->Assets->theme.css

#shopify-section-16083091747d93f185 .input-group.newsletter__input-group input#Email- {
    color: black;
}
3

You’re a legend. Thank you.