@-webkit-keyframes sk-stretchdelay {
    0%, 40%, 100% { -webkit-transform: scaleY(0.4) }
    20% { -webkit-transform: scaleY(1.0) }
}

@keyframes sk-stretchdelay {
    0%, 40%, 100% {
        transform: scaleY(0.4);
        -webkit-transform: scaleY(0.4);
    }  20% {
           transform: scaleY(1.0);
           -webkit-transform: scaleY(1.0);
       }
}