body {
  font-family: Arial, sans-serif;
  background: #f5f5f5;
  margin: 0; padding: 0;
}
.form-box {
  background: #fff;
  max-width: 400px;
  margin: 80px auto;
  padding: 20px;
  border: 1px solid #ccc;
  border-radius: 5px;
}
.form-box h1 { margin-top: 0; }
.form-box label { display: block; margin: 10px 0; }
.form-box input { width: 100%; padding: 8px; box-sizing: border-box; }
.form-box button {
  padding: 10px 20px; background: #0078d7; color: #fff; border: none;
  border-radius: 3px; cursor: pointer;
}
.form-box button:hover { background: #005a9e; }
.error { color: red; margin-bottom: 15px; white-space: pre-wrap; }