body {
  font-family: Arial, sans-serif;
  margin: 20px;
  background: #f7f7f7;
}
input, textarea, select, button {
  display: block;
  margin: 10px 0;
  padding: 8px;
  width: 100%;
  max-width: 400px;
}
h1 { color: #333; }