Change Color of Newsletter Signup Form Text

Hi all,

The newsletter signup form is hardly readable on my site. Please see credentials below.

You told me in another thread to use the following CSS code to make the text white:

.page-id-431 #element_avia_3_1 {
color: #fff !important;
}

However, unfortunately it doesn’t work anymore. The reason is that I now use a Mailchimp form instead of a normal newsletter signup form.

What do I have to do in this case?

Thanks!