CB Facebook Connection Button in CB Login Module

The Facebook button is showing like the connect button and not like Facebook.
See my site : http://www.rbbgx.be

i've added

.mod_login .fbc_button {
background-image: url(../images/style1/buttonFB.png) !important;
background-repeat: no-repeat !important;
background-position: 0px 0px !important;
cursor: pointer !important;
height: 21px !important;
width: 75px !important;
padding-left: 20px !important;
margin-top: 2px !important;
margin-bottom: 2px !important;
border-width: 0px !important;
color: #FFFFFF !important;
font-size: 10px !important;
font-weight: bold !important;
}
.mod_login .fbc_button_small
{
background-image: url(../images/style1/buttonFB.png)!important;
background-repeat: no-repeat !important;
background-position: 0px 0px !important;
cursor: pointer !important;
height: 21px !important;
width: 20px !important;
margin-left: 2px !important;
margin-right: 2px !important;
border-width: 0px !important;
}

to override.css, style1.css and style2.css and placed the buttonFB in the style1 folder but no change

I forgot to mention I'm using Joomla 2.5 and CB 1.8

Anybody here in the support team ?