@-webkit-keyframes rotating {
    0%{
        -webkit-transform: rotate(-6deg);
    }
    50%{
        -webkit-transform: rotate(6deg);
    }
    100%{
        -webkit-transform: rotate(-6deg);
    }
}@keyframes rotating {
    0%{
        -webkit-transform: rotate(-6deg);
    }
    50%{
        -webkit-transform: rotate(6deg);
    }
    100%{
        -webkit-transform: rotate(-6deg);
    }
}


.flying_saucer {
    display:block;
    width:100px;
    height:100px;
    background-image:url('http://lorempixel.com/200/100/sports/1/');
    position: absolute;
    white-space: nowrap;
    text-indent: 100%;
    overflow: hidden;
    animation: rotating 10s linear infinite;
    -webkit-animation: rotating 10s linear infinite;
}
.flying_saucer.paracadute {
    width:160px;
    height:223px;
    background-image:url('/img/share/animazioni/paracadute.png');
}

.flying_saucer.mongolfiera {
    width:112px;
    height:198px;
    background-image:url('/img/share/animazioni/mongolfiera.png');
}

.flying_saucer.elicottero {
    width:204px;
    height:90px;
    background-image:url('/img/share/animazioni/elicottero.png');
}