Font Color Change

Hi,

I’m trying to change the color of the ‘reply message’ text after sign-up on the top form of my landing page. After a person enters their details, the reply message cannot be read due to the background color of the form. I would like to have this text color changed to white.

I am at Customizing -> Additional CSS, and I entered the following code but not working…

label {
color: #ffffff !important;
}

I’ll appreciate your help.
Thank you,
Tammy

The page I need help with: [log in to see the link]