HTML代码

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<div class="bjimg"></div>

CSS代码

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.bjimg {
	position: fixed;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	min-width: 1000px;
	z-index: -10;
	zoom: 1;
	background-color: #fff;
	background-image: url(../static/images/background.png);
	background-repeat: no-repeat;
	background-size: cover;
	-webkit-background-size: cover;
	-o-background-size: cover;
	background-position: center 0;
}

PS.

来源：给网页添加背景图片 html+css_北极光之夜。-CSDN博客