How to achieve mask effect in css

Important knowledge points:

(Recommended tutorial: css quick start)

background-color:#fff;filter:Alpha(Opacity=60);opacity:0.6;

Style:

<style>
    .back {background:url(images/coupon-logo.gif) no-repeat;}
    .top {height:100px;background-color:#fff;filter:Alpha(Opacity=60);opacity:0.6;}
</style>

html code:

<div class="back">
    <div class="top"></div>
</div>

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