social.css

body {
    width: 960px;
    margin: 0 auto;
    text-align: center;
}

button {
    width: 100px;
    height: 40px;
    border: none;
    outline: none;
    cursor: pointer;
    -webkit-transition: all 0.3s ease-in-out;
    -moz-transition: all 0.3s ease-in-out;
    -o-transition: all 0.3s ease-in-out;
    transition: all 0.3s ease-in-out;
}

button.share_twitter {
    background-color: #46c0fb;
    color: #fff;
}

button.share_google-plus {
    background-color: #dd4a38;
    color: #fff;
}

button.share_linkedin {
    background-color: #0083a8;
    color: #fff;
}

button.share_facebook {
    background-color: #4863ae;
    color: #fff;
}

button.share_facebook:hover {
    background-color: transparent;
    color: #4863ae;
    border: 1px solid #4863ae;
}

button.share_linkedin:hover {
    background-color: transparent;
    color: #0083a8;
    border: 1px solid #0083a8;
}

button.share_google-plus:hover {
    background-color: transparent;
    color: #dd4a38;
    border: 1px solid #dd4a38;
}

button.share_twitter:hover {
    background-color: transparent;
    color: #46c0fb;
    border: 1px solid #46c0fb;
}

.fa {
    font-size: 1.5em;
}