body {
  font-family: Arial, sans-serif;
  max-width: 400px;
  margin: 60px auto;
  padding: 0 20px;
}
h1 { font-size: 22px; margin-bottom: 20px; }
input {
  display: block;
  width: 100%;
  padding: 10px;
  margin-bottom: 12px;
  box-sizing: border-box;
}
button {
  padding: 10px 16px;
  background: #1a1a1a;
  color: white;
  border: none;
  cursor: pointer;
}
#message { color: #c0392b; margin-top: 10px; }