body {
    margin: 0;
    overflow: hidden; 
    background: #222; 
    height: 100vh;
}

/* 樱花样式 */
.sakura {
    position: absolute;
    top: -10px; 
    background-color: #ffdde1; 
    border-radius: 100% 0 100% 0; 
    pointer-events: none; 
    opacity: 0.8;
    animation: fall linear infinite;
    z-index: 9999; 
}

/* 飘落动画 */
@keyframes fall {
    0% {
        top: -10%;
        transform: translateX(0) rotate(0deg);
        opacity: 0.8;
    }
    20% {
        transform: translateX(20px) rotate(45deg);
    }
    40% {
        transform: translateX(-20px) rotate(90deg);
    }
    60% {
        transform: translateX(20px) rotate(135deg);
    }
    80% {
        transform: translateX(-20px) rotate(180deg);
    }
    100% {
        top: 110%; 
        transform: translateX(0) rotate(225deg);
        opacity: 0;
    }
}