.whole_head {
    animation: head_down 2s ease-in-out infinite;
    transform-origin: center;
}
@keyframes head_down { 50% { transform: translateY(10px); } }

.eye_left, .eye_right {
    animation: blinking 2s ease-in-out infinite;
}
@keyframes blinking { 10% { opacity: 0; } 12% { opacity: 1; } }