代码如下：
<!DOCTYPE html>
<html lang="zh">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>在线留言板</title>
<style>
body {
font-family: Arial, sans-serif;
text-align: center;
margin: 20px;
}
.container {
max-width: 400px;
margin: auto;
padding: 20px;
border: 1px solid #ddd;
border-radius: 10px;
box-shadow: 2px 2px 10px rgba(0,0,0,0.1);
}
textarea {
width: 100%;
height: 80px;
padding: 10px;
border-radius: 5px;
border: 1px solid #ddd;
resize: none;
}
button {
margin-top: 10px;
padding: 8px 15px;
border: none;
background-color: #28a745;
color: white;
cursor: pointer;
border-radius: 5px;
}
button:hover {
background-color: #218838;
}
.message {
background: #f8f9fa;
padding: 10px;
border-radius: 5px;
margin: 10px 0;
display: flex;
justify-content: space-between;
align-items: center;
}
.delete-btn {
background
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