body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  background-color: #f4f4f9;
  color: #333;
}

header {
  background: #007bff;
  color: #fff;
  padding: 1em 0;
  text-align: center;
}

main {
  padding: 1em;
}

h2 {
  color: #007bff;
}

button {
  background: #007bff;
  color: #fff;
  border: none;
  padding: 0.5em 1em;
  margin: 0.5em 0;
  cursor: pointer;
  font-size: 1em;
}

button:hover {
  background: #0056b3;
}

footer {
  text-align: center;
  padding: 1em 0;
  background: #e9ecef;
}