body {
background-size: cover;
background-position: center;
background-repeat: no-repeat;
}
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css更改背景图片动画.txt |css ellipsis
局部引入css，a里面加css，垂直线css，epp4 css 提示，css li 去点的属性，css把屏幕沾满怎么写，css ellipsis
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body {
background-size: cover;
background-position: center;
background-repeat: no-repeat;
}