Favicon link in css

                                          HTML :     CSS:body {
    background-image: ;
    background-color: #999;
    background-image: -webkit-linear-gradient(0, rgba(255,255,255,.07) 50%, transparent 50%),  -webkit-linear-gradient(0, rgba(255,255,255,.13) 50%, transparent 50%),  -webkit-linear-gradient(0, transparent 50%, rgba(255,255,255,.17) 50%),  -webkit-linear-gradient(0, transparent 50%, rgba(255,255,255,.19) 50%);
    background-image: -o-linear-gradient(0, rgba(255,255,255,.07) 50%, transparent 50%),  -o-linear-gradient(0, rgba(255,255,255,.13) 50%, transparent 50%),  -o-linear-gradient(0, transparent 50%, rgba(255,255,255,.17) 50%),  -o-linear-gradient(0, transparent 50%, rgba(255,255,255,.19) 50%);
    background-image: -moz-linear-gradient(0, rgba(255,255,255,.07) 50%, transparent 50%),  -moz-linear-gradient(0, rgba(255,255,255,.13) 50%, transparent 50%),  -moz-linear-gradient(0, transparent 50%, rgba(255,255,255,.17) 50%),  -moz-linear-gradient(0, transparent 50%, rgba(255,255,255,.19) 50%);
    background-image: -ms-linear-gradient(0, rgba(255,255,255,.07) 50%, transparent 50%),  -ms-linear-gradient(0, rgba(255,255,255,.13) 50%, transparent 50%),  -ms-linear-gradient(0, transparent 50%, rgba(255,255,255,.17) 50%),  -ms-linear-gradient(0, transparent 50%, rgba(255,255,255,.19) 50%);
    /*background-size*/     -webkit-background-size: 13px, 29px, 37px, 53px;
    -moz-background-size: 13px, 29px, 37px, 53px;
    -o-background-size: 13px, 29px, 37px, 53px;
    background-size: 13px, 29px, 37px, 53px;
    padding-top: 50px;
    text-align: center;
}
nav {
    height: 30px;
    margin: 30px auto;
    padding: 10px 5px;
    /*border-radius*/     -webkit-border-radius: 5px;
    -moz-border-radius: 5px;
    border-radius: 5px;
    width: 560px;
    bottom: 26px;
    padding: 12px 12px 12px 12px;
    background: #fff;
    background: -webkit-gradient( linear, 0 0, 0 100%, from(#fff), to(#e5eaee) );
    /*linear-gradient*/     background: -webkit-gradient(linear, , from(#fff), to(#e5eaee));
    background: -webkit-linear-gradient( top center, #fff, #e5eaee );
    background: -moz-linear-gradient( top center, #fff, #e5eaee );
    background: -o-linear-gradient( top center, #fff, #e5eaee );
    background: linear-gradient( top center, #fff, #e5eaee );
    /*box-shadow*/     -webkit-box-shadow: 0 1px 2px #000;
    -moz-box-shadow: 0 1px 2px #bdc9d5;
    box-shadow: 0px 1px 5px #666;
    font: 13px "helvetica", sans-serif;
    font-weight: 300;
    text-align: center;
    text-shadow: 0 1px 0 #fff;
    -webkit-tansition: all 10s linear infinite;
}
a[href*="github.com"] {
    padding-left: 18px;
    background: url("http://www.google.com/s2/u/0/favicons?domain=gist.github.com") left center no-repeat;
}
a[href*="facebook.com"] {
    padding-left: 18px;
    background: url("http://www.google.com/s2/u/0/favicons?domain=facebook.com") left center no-repeat;
}
a[href*="youtube.com"] {
    padding-left: 18px;
    background: url("http://www.google.com/s2/u/0/favicons?domain=youtube.com") left center no-repeat;
}
a[href*="twitter.com"] {
    padding-left: 18px;
    background: url("http://www.google.com/s2/u/0/favicons?domain=twitter.com") left center no-repeat;
}
a[href*="megawrz.com"] {
    padding-left: 18px;
    background: url("http://www.google.com/s2/u/0/favicons?domain=megawrz.com") left center no-repeat;
}
a {
    /*transition*/     -webkit-transition: all 0.2s ease;
    -moz-transition: all 0.2s ease;
    -o-transition: all 0.2s ease;
    transition: all 0.2s ease;
    color: #999;
    font-size: 12px;
    text-decoration: none;
    margin: 20px 20px;
    padding-left: 23px !important;
    text-shadow: 1px 1px 0px white;
}
a:hover {
    color: #555;
}