ul.social-links {
    margin: 0;
    padding: 0;
    list-style: none;
    line-height: 0;
}

ul.social-links li {
    display: inline-block;
}

ul.social-links li a {
    background: no-repeat 0 0;
    background-size: cover;
    width: 32px;
    height: 32px;
    display: block;
    -webkit-transition: background-position .1s linear;
    -moz-transition: background-position .1s linear;
    -o-transition: background-position .1s linear;
    transition: background-position .1s linear;
}

ul.social-links li a:hover {
    background-position: 0 -32px;
}

ul.social-links a.social-links-facebook {
    background-image: url(../images/facebook.png);
}

ul.social-links a.social-links-googleplus {
    background-image: url(../images/googleplus.png);
}

ul.social-links a.social-links-linkedin {
    background-image: url(../images/linkedin.png);
}

ul.social-links a.social-links-pinterest {
    background-image: url(../images/pinterest.png);
}

ul.social-links a.social-links-rss {
    background-image: url(../images/rss.png);
}

ul.social-links a.social-links-twitter {
    background-image: url(../images/twitter.png);
}

ul.social-links a.social-links-youtube {
    background-image: url(../images/youtube.png);
}

ul.social-links a.social-links-instagram{
    background-image: url(../images/instagram.png);
}

ul.social-links a.social-links-blog{
    background-image: url(../images/blog.png);
}
ul.social-links a.social-links-blue-sky{
    background-image: url(../images/blue-sky.png);
}