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HTML代码 <div id="banner"> <p>This is a self-closing banner.</p> <button id="close-banner">X</button> </div> css代码 #banner { background-color: #f1f1f1; padding: 10px; position: fixed; bottom: 0; left: 0; width: 100%; text-align: c...
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HTML代码 <div id="banner"> <p>This is a self-closing banner.</p> <button id="close-banner">X</button> </div> css代码 #banner { background-color: #f1f1f1; padding: 10px; position: fixed; bottom: 0; left: 0; width: 100%; text-align: c...
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