body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  background-color: #f0f0f0;
}

header {
  background-color: #4CAF50;
  color: white;
  padding: 20px;
  text-align: center;
  width: 100%;
}

h1 {
  margin: 0;
}

main {
  padding: 20px;
  text-align: center;
}

button {
  padding: 10px 20px;
  font-size: 16px;
  background-color: #4CAF50;
  color: white;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  transition: background-color 0.3s;
}

button:hover {
  background-color: #45a049;
}

footer {
  margin-top: auto;
  padding: 10px;
  background-color: #333;
  color: white;
  text-align: center;
  width: 100%;
}