phone number in sub header

Hi,
I’m trying to change the color of the phone number in the sub header.

http://www.mel.hummingbirdwebdesign.com

I added some css but the color is faded, like maybe I need to change the opacity to 100% but don’t know how to write that. I need this area to really pop and stand out. Even when I change it to black it isn’t dark enough.
/*header contact*/
.header_contact_item{
font-size: 24px;
color:#174477;
font-weight:800;
}

Thank you,
Nancy