网页遮罩层效果 点击按钮网页中间弹出窗口 弹出遮罩层

<style> .bg{position:absolute;z-index:999;filter:alpha(opacity=50);background:#666;opacity: 0.5;-moz-opacity: 0.5;left:0;top:0;height:99%;width:100%;} .beian_winBG { MARGIN-TOP: -100px; LEFT: 50%; MAR

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