How can I change the newsletter button text color to black?

[Maylly]

Hello,

Could you please help to change newsletter text inside button? 

Right now its white on white, I need black. Store name is under the password, not sure if i can share it

this doesn work :

.site-footer .input-group .input-group-field {
color: #fff;
}

[KetanKumar]

@Maylly 

Sorry you are facing this issue, it would be my pleasure to help you.

Welcome to the Shopify community!😊
Thanks for your good question.

Please share your site URL,
I will check out the issue and provide you a solution here.