body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  text-align: center;
  background: linear-gradient(to bottom, #f9f9f9, #e0f7fa);
}

header {
  background-color: #00796b;
  color: white;
  padding: 20px;
}

h1 {
  margin: 0;
}

main {
  padding: 40px;
}

button {
  background-color: #00796b;
  color: white;
  border: none;
  padding: 10px 20px;
  font-size: 16px;
  cursor: pointer;
}

button:hover {
  background-color: #004d40;
}

footer {
  background-color: #f1f1f1;
  padding: 10px;
  font-size: 14px;
}