#tet-effect{position:fixed;inset:0;pointer-events:none;overflow:hidden;z-index:50}.petal{position:absolute;top:-50px;width:24px;height:24px;background-image:url(/images/hoa-dao.png);background-size:cover;animation:fall linear infinite;opacity:.8}@keyframes fall{0%{transform:translateY(0) rotate(0deg)}to{transform:translateY(110vh) rotate(1turn)}}@keyframes fly{0%{transform:translateX(-10vw)}to{transform:translateX(110vw)}}