transparent layer-pop-up layer <br> *{margin:0;padding:0;}<br> .main{width:100%; height:1000px ;}<br> .div1{<br> top:0;<br> left:0;<br> width:100%;<br> height:1000px;<br> position:absolute; <br> z-index :10;</p> <p> }<br> .div2{<br> width:100%;<br> height:1000px;<br> z-index:-1;<br> position:absolute;<br> /***/<br> background:#000000;<br> filter:alpha(opacity=70); <br> -moz-opacity:0.7; <br> -khtml-opacity: 0.7; <br> opacity: 0.7; <br> }<br> .div3{<br> margin-left:100px;<br> width:100px;<br> height:200px;<br> background:yellow;<br> } <div class="main">dsadd</div><br> <div class= "div1"><br> <br><!-- Because the child element will inherit the <🎝>opacity of the parent element, define an empty div as <🎝> --><br> <br> <div class="div2"></div></p> <div class="div3">wqeqwe</div><p> </div></p></body><p>< ;/html><br> <br></p>