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| <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title></title> <style type="text/css"> .one:after{ content: "哈哈"; background-color: salmon; color: yellow; font-size: 30px; width: 200px; display: block; } .one::before{ content: "你好 世界!"; } .box{ background-color: deeppink; position: relative; } .box:after{ content: ""; clear: both; display: block;
} .d1{ width: 300px; height: 200px; background-color: palegreen; float: left; } .d2{ width: 300px; height: 300px; background-color: palevioletred; float: left; } .over{ width: 340px; height: 340px; background-color: rgba(0,0,0,0.4); position: absolute; left: 280px; top: -20px; } </style> </head> <body> <div class="one"> <a href="###">京东</a> <p>段落块元素</p> <span>你呵呵</span> </div> <div class="box"> <div class="d1">1111111111</div> <div class="d2">2222222222</div> <div class="over">悬浮层</div> </div> <h1 style="background-color: salmon;">大标题</h1> </body> </html>
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