pid &gt; div:nth-child(1),
.la-line-scale-pulse-out-rapid &gt; div:nth-child(5) {
    -webkit-animation-delay: -.4s;
       -moz-animation-delay: -.4s;
         -o-animation-delay: -.4s;
            animation-delay: -.4s;
}
.la-line-scale-pulse-out-rapid.la-sm {
    width: 20px;
    height: 16px;
}
.la-line-scale-pulse-out-rapid.la-sm &gt; div {
    width: 2px;
    height: 16px;
    margin: 1px;
    margin-top: 0;
    margin-bottom: 0;
}
.la-line-scale-pulse-out-rapid.la-2x {
    width: 80px;
    height: 64