body:before {
content: ' ';
position: fixed;
z-index: -1;
top: 0;
right: 0;
bottom: 0;
left: 0;
background: url(...) center 0 no-repeat;
background-size: cover;
}
End mobile solutions background can not be fixed
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Origin blog.csdn.net/weixin_43553701/article/details/93369588
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