a.btn-facebook, a.btn-twitter, a.btn-linkedin {
    display: inline-block;
    font-size: 12px;
    color: #fff;
    background-color: #777;
    padding: 4px 8px 2px 8px; 
    margin-right: 6px;
    border-radius: 3px;
    font-family: Helvetica, Arial, sans-serif;
    text-decoration: none;
    border: 1px solid #777;
}
a.btn-facebook i, a.btn-twitter i, a.btn-linkedin i{
    font-size: 15px;
    padding-right: 3px;
}
a.btn-facebook:hover, a.btn-twitter:hover, a.btn-linkedin:hover{
    
    background-color: #555; 
}