.windmill_blades{animation:spin 4s linear infinite}@keyframes spin{0%{transform:rotate(0deg);transform-origin:320px 245px}25%{transform:rotate(90deg);transform-origin:320px 246px}50%{transform:rotate(180deg);transform-origin:320px 246px}75%{transform:rotate(270deg);transform-origin:320px 246px}to{transform:rotate(1turn);transform-origin:320px 245px}}