#tet-effect{position:fixed;inset:0;pointer-events:none;overflow:hidden;z-index:50}.petal{top:-50px;width:24px;background-image:url(/images/hoa-dao.png);animation:fall linear infinite;opacity:.8}.petal,.swallow{position:absolute;height:24px;background-size:cover}.swallow{top:20%;width:40px;background-image:url(/images/canh-en.png);animation:fly linear infinite}@keyframes fall{0%{transform:translateY(0) rotate(0deg)}to{transform:translateY(110vh) rotate(1turn)}}@keyframes fly{0%{transform:translateX(-10vw) translateY(calc(var(--i, 0) * 10vh - 10vh)) scale(var(--s,1))}to{transform:translateX(110vw) translateY(calc(var(--i, 0) * 10vh - 10vh)) scale(var(--s,1))}}