.loading {
	position: fixed;
	top: 0;
	left: 0;
	width: 100%;
	height: 100vh;
	object-fit: cover;
	z-index: 999;
}
.loading-shuhua {
	position: fixed;
	top: 50%;
	left: 50%;
	transform: translate(-50%, -50%);
	width: 788px; /* 自定义宽度 */
	height: 224px; /* 自定义高度 */
	background-color: white; /* 自定义背景色 */
}
.bk1 {
	background-image: url(https://www-cn.sdshyycl.com/uploadfiles/2025/05/20250526104437434.jpg);
}
.bk2 {
	background-image: url(https://www-cn.sdshyycl.com/uploadfiles/2025/07/20250717093955447.png);
}
.bk3 {
	background-image: url(https://www-cn.sdshyycl.com/uploadfiles/2025/08/20250818144902754.png);
}
.bk4 {
	background-image: url(https://www-cn.sdshyycl.com/uploadfiles/2025/07/20250729091747724.jpg);
}
.bk5 {
	background-image: url(https://www-cn.sdshyycl.com/uploadfiles/2025/08/20250820101740361.jpg);
}
.bk6 {
	background-image: url(https://www-cn.sdshyycl.com/uploadfiles/2025/01/20250103100241156.jpg);
}
.bk7 {
	background-image: url(https://www-cn.sdshyycl.com/uploadfiles/2025/01/20250103100306085.jpg);
}
.bk8 {
	background-image: url(https://www-cn.sdshyycl.com/uploadfiles/2025/01/20250103100315441.jpg);
}
.bk9 {
	background-image: url(https://www-cn.sdshyycl.com/uploadfiles/2025/10/20251022150857984.jpg);
}
.bk10 {
	background-image: url(https://www-cn.sdshyycl.com/uploadfiles/2025/08/20250828155203766.jpg);
}
.bk11 {
	background-image: url(https://www-cn.sdshyycl.com/uploadfiles/2024/10/20241029135704306.jpg);
}
.bk12 {
	background-image: url(https://www-cn.sdshyycl.com/uploadfiles/2025/08/20250828155213273.jpg);
}
.bk13 {
	background-image: url(https://www-cn.sdshyycl.com/uploadfiles/2024/11/20241105100915785.jpg);
}
.bk14 {
	background-image: url(https://www-cn.sdshyycl.com/uploadfiles/2024/11/20241105100949145.jpg);
}
.bk15 {
	background-image: url(?cn/images/casebg.jpg);
}
.bk16 {
	background-image: url(?cn/images/bottombg.jpg);
}
.bk17 {
	background-image: url(https://www-cn.sdshyycl.com/uploadfiles/2024/08/20240823165343586.png);
}
.bk18 {
	background-image: url(https://www-cn.sdshyycl.com/uploadfiles/2024/08/20240823165354030.png);
}
.bk19 {
	background-image: url(https://www-cn.sdshyycl.com/uploadfiles/2024/08/20240823165406170.png);
}
.bk20 {
	background-image: url(https://www-cn.sdshyycl.com/uploadfiles/2025/04/20250422132421328.png);
}