How to Theme Mail Chimp's Super Slim Subscribe Form
Mail Chimp allows their users to theme the signup form but doesn't offer a way to theme, or design, the embedded Super Slim signup form.
With CSS overrides, you can make your embedded form elements, such as the Subscribe button, match the colors of your website:
/*============== Background color of the embed form container ===================*/
#mc_embed_signup {
background: #E1D8C1 !important;
}
/*============== Background color of the embed form ===================*/
#mc_embed_signup form {
background: #E1D8C1; !important;
border: 1px dotted #C5B39E !important;
border-radius: 10px !important;
}
/*============== Background color of the Subscribe button ===================*/
#mc_embed_signup .button {
background: #561D14 !important;
}
/*============== Background color of the Subscribe button on mouse hover ===================*/
#mc_embed_signup .button:hover {
background: #703C34 !important;
}