.earth {
    width:300px;
    height:300px;
    /*https://raw.githubusercontent.com/cartalan/TierraGirando/master/img/mapa.png*/
    background-image:url(../img/mapa2.png);
    background-size:cover;
    border-radius:50%;
    position:absolute;
    top:0;
    right:0;
    bottom:0;
    left:0;
    margin:auto;
    box-shadow:-30px -20px 0 0 rgba(0,0,0,.15) inset, -70px -30px 0 0 rgba(0,0,0,.1) inset, 5px 5px 0 0 rgba(255,255,255,.2) inset;
    -webkit-animation:rotationEarth 5s infinite linear;
    -moz-animation:rotationEarth 5s infinite linear;
    animation:rotationEarth 5s infinite linear;
}

@-webkit-keyframes rotationEarth {
   from {
       background-position:left center;
   }
   to {
       background-position: -596px center;
   }
}

@keyframes rotationEarth {
   from {
       background-position:left center;
   }
   to {
       background-position: -596px center;
   }
}