.sk-rotating-plane{width:40px;height:40px;background-color:#333;margin:40px auto;animation:sk-rotatePlane 1.2s infinite ease-in-out}@keyframes sk-rotatePlane{0%{transform:perspective(120px) rotateX(0deg) rotateY(0deg)}50%{transform:perspective(120px) rotateX(-180.1deg) rotateY(0deg)}to{transform:perspective(120px) rotateX(-180deg) rotateY(-179.9deg)}}