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<link href="//netdna.bootstrapcdn.com/font-awesome/4.0.3/css/font-awesome.css" rel="stylesheet">
<style>
ul {
    overflow: auto;
}
 
ul li {
    list-style-type: none;
    float: left;
}
 
ul li a i {
    background: #205D7A;
    color: #fff;
    width: 40px;
    height: 40px;
    border-radius: 20px;
    font-size: 25px;
    text-align: center;
    margin-right: 10px;
    padding-top: 15%;
    transition: all 0.2s ease-in-out;
}

.fa-facebook {
    background:#3b5998
} 
.fa-linkedin {
    background:#007bb6
}
.fa-twitter {
    background:#00aced
}
.google-plus {
    background:#dd4b39
}
ul li a i:hover {
    opacity: .7;
}
</style>
 
<ul>
    <li><a href="http://facebook.com/"><i class="fa fa-facebook"></i></a></li>
    <li><a href="http://linkedin.com/"><i class="fa fa-linkedin"></i></a></li>
    <li><a href="http://twitter.com/"><i class="fa fa-twitter"></i></a></li>
    <li><a href="http://plus.google.com/"><i class="fa fa-google-plus"></i> </a></li>
</ul>