Mail Chimp widget not responding to code change

Hi,

I installed the Mail Chimp widget to create a subscription form. The subscription button is very light, it looks like some part of my 2012 template is over-riding the appearance of the button as it’s not what it looks like in the Mail Chimp preview.

I’ve tried changing the CSS code, my latest attempt was this:

#mc_embed_signup .button {
background-color: rgb(60, 60, 60);
color: rgb(100, 100, 100);
}

But changing these parameters leads to no change in the button appearance. When I inspect the code I don’t see anything else that makes sense to modify. I’m at a basic level with CSS code changes, and don’t know how to modify html.

I would appreciate any help with this. There is one on my homepage at http://www.melissarosenberger.com

Thank you!