背景图片自适应整个页面CSS+DIV

<body style="overflow:hidden;">
    <div class="wrapper">
        <!--背景图片-->
        <div id="web_bg" style="background-image: url(/images/welcome.png);background-size:100% 100%"></div>
        <!--其他代码 ... -->
    </div>
</body>
</html>
<style>
    #web_bg {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        z-index: -10;
        zoom: 1;
        background-color: #fff;
        background-repeat: no-repeat;
        background-size: cover;
        -webkit-background-size: cover;
        -o-background-size: cover;
        background-position: center 0;
    }
</style>

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