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343 B

body::after {
position: fixed;
content: '';
left: -1000px;
top: -1000px;
animation: shadow-preload 0.1s;
animation-delay: 3s;
}
@keyframes shadow-preload {
0% {
background-image: url(https://cdn.dcloud.net.cn/img/shadow-grey.png);
}
100% {
background-image: url(https://cdn.dcloud.net.cn/img/shadow-grey.png);
}
}