代码：
<style> html,body{margin:0px;padding:0px;} #background { position: fixed;top: 0;left: 0;width: 100%;height: 100%;overflow: hidden;background-color: #211f1f; display:none\8;} #background .bg-photo {position: absolute;top: 0;left: 0;width: 100%;height: 100%;display: none;overflow: hidden;-webkit-background-size: cover !important;-moz-background-size: cover !important;-o-background-size: cover !important;background-size: cover !important;} #background .bg-photo-1 { url(1.jpg ) no-repeat center center;} #background-ie { position: fixed;top: 0;left: 0;width: 100%;height: 100%;overflow: hidden;background-color: #211f1f;} </style> <div id="background"> <div class="bg-photo bg-photo-1" style="display: block;"></div> </div>
以上就是css背景图根据屏幕大小自动缩放的详细内容。