body {
  font-family: Arial, sans-serif;
  max-width: 800px;
  margin: 40px auto;
  padding: 0 20px;
}
h2 { color: #333; }
form input, form button {
  display: block;
  margin: 10px 0;
  padding: 8px;
  width: 100%;
  max-width: 300px;
}
.error { color: red; }
table {
  border-collapse: collapse;
  width: 100%;
  margin-top: 20px;
}
table, th, td { border: 1px solid #ccc; }
th, td { padding: 8px; text-align: left; }
a { color: #0066cc; text-decoration: none; }
a:hover { text-decoration: underline; }