* {
    margin: 0;
    padding: 0;
}

.site-footer{
    position:relative;
    margin-top:40px;
    padding:40px 0;
    font-size:12px;
    line-height:1.5;
    color:#777;
    border-top:2px solid #eee
}

.site-footer .octicon-mark-github {
    position: absolute;
    left: 50%;
    color: #ccc;
}
* {
    margin: 0;
    padding: 0;
}

.site-footer{
    position:relative;
    margin-top:40px;
    padding:40px 0;
    font-size:12px;
    line-height:1.5;
    color:#777;
    border-top:2px solid #eee
}

.site-footer .octicon-mark-github {
    position: absolute;
    left: 50%;
    color: #ccc;
}

.site-footer .octicon-mark-github:hover {
    color:#bbb;
}
Add hover on bottom icon
Add hover on bottom icon
