@keyframes square-spin{25%{transform:perspective(100px) rotateX(180deg) rotateY(0)}50%{transform:perspective(100px) rotateX(180deg) rotateY(180deg)}75%{transform:perspective(100px) rotateX(0) rotateY(180deg)}100%{transform:perspective(100px) rotateX(0) rotateY(0)}}.square-spin>div{width:50px;height:50px;background:#6b6f82;animation:square-spin 3s 0s cubic-bezier(.09,.57,.49,.9) infinite}