/* 蓝色圆环旋转动画 */
@keyframes rotateRing {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}
/* 背景旋转动画 */
@keyframes rotateBackground {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}