icons.css

.icon-collapse, .icon-expand {
    background-image: url("img/icon-collapse-expand.png");
    background-position: left top;
    background-repeat: no-repeat;
    height: 14px;
    margin-right: 1em;
    width: 14px;
}
.icon-expand {
    background-position: left -14px;
    margin-top: -1px;
}
.social:before {
    display: inline-block;
    font: 120%/1.65 zocial;
    padding-right: 10px;
    width: 28px;
}
.social.googleplus:before {
    color: #D54431;
    content: "+";
}
.social.google:before {
    color: #3078F0;
    content: "G";
}
.social.twitter:before {
    color: #46C0FB;
    content: "T";
}
.social.facebook:before {
    color: #4863AE;
    content: "f";
}