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<title>没有宽度和高度声明实现的全屏自适应效果</title>
<style>
html, body { height: 100%; }
.overlay {
position: absolute;
left: 0; top: 0; right: 0; bottom: 0;
background-color: #000;
opacity: .5; filter: alpha(opacity=50);
}
</style>
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