Hi Rob,
You can find and change background color on here
Open templates/ja_beranis/css/template.css file
.t3-social a.icon-facebook {
background-color: #0066b9;
}
.t3-social a.icon-facebook:focus,
.t3-social a.icon-facebook:hover {
color: #0066b9;
background: #fff;
}
.t3-social a.icon-twitter {
background-color: #0093c3;
}
.t3-social a.icon-twitter:focus,
.t3-social a.icon-twitter:hover {
color: #0093c3;
background: #fff;
}
.t3-social a.icon-google-plus {
background-color: #ec3216;
}
.t3-social a.icon-google-plus:focus,
.t3-social a.icon-google-plus:hover {
color: #ec3216;
background: #fff;
}
Regards