为其设置背景色,图片不重复,且不会随着滚动条进行滚动:
background:url("https://ss1.bdstatic.com/70cFvXSh_Q1YnxGkpoWK1HF6hhy/it/u=3644873427,61171858&fm=26&gp=0.jpg") no-repeat fixed;
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