@keyframes falling {
    0% {
        transform: translateY(0) translateX(0) rotate(0deg);
        opacity: 1;
    }
    100% {
        transform: translateY(100vh) translateX(calc(10vw - 5vw)) rotate(360deg);
        opacity: 0;
    }
}

/* Hoa đào */
.flower {
    position: fixed;
    top: -5vh;
    font-size: calc(15px + 10 * random()); /* Kích thước ngẫu nhiên */
    animation: falling linear infinite;
    pointer-events: none;
}