@keyframes swing {
    20% {
        transform: rotate3d(0, 0, 1, 15deg)
    }
    40% {
        transform: rotate3d(0, 0, 1, -10deg)
    }
    60% {
        transform: rotate3d(0, 0, 1, 5deg)
    }
    80% {
        transform: rotate3d(0, 0, 1, -5deg)
    }
    to {
        transform: rotate3d(0, 0, 1, 0deg)
    }
}

.swing {
    transform-origin: top center;
    animation-name: swing
}