body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 20px;
  background: #f9f9f9;
}
header {
  background: #222;
  color: #fff;
  padding: 20px;
  text-align: center;
}
main {
  padding: 20px;
  text-align: center;
}
form {
  background: white;
  max-width: 500px;
  margin: 30px auto;
  padding: 20px;
  border-radius: 5px;
  box-shadow: 0 0 10px #ccc;
}
input {
  margin-bottom: 12px;
  padding: 10px;
  width: 100%;
}
button, .btn {
  background: #28a745;
  color: white;
  padding: 10px;
  width: 100%;
  border: none;
  border-radius: 5px;
  cursor: pointer;
}
button:hover, .btn:hover {
  background: #218838;
}
.btn-secondary {
  background-color: #007bff;
}
.btn-secondary:hover {
  background-color: #0056b3;
}