kit-animation-name: ball-fussion-ball3;
       -moz-animation-name: ball-fussion-ball3;
         -o-animation-name: ball-fussion-ball3;
            animation-name: ball-fussion-ball3;
}
.la-ball-fussion &gt; div:nth-child(4) {
    top: 50%;
    left: 0;
    z-index: 2;
    -webkit-animation-name: ball-fussion-ball4;
       -moz-animation-name: ball-fussion-ball4;
         -o-animation-name: ball-fussion-ball4;
            animation-name: ball-fussion-ball4;
}
.la-ball-fussion.la-sm {
    width: 4px;
    hei