body {
  background-color: #f0f8ff;
  font-family: 'Helvetica Neue', sans-serif;
  color: #333;
}

header {
  background-color: #4caf50;
  color: white;
  padding: 10px 0;
  text-align: center;
}

nav {
  margin: 0 auto;
  padding: 10px;
  text-align: center;
}

nav a {
  margin: 0 15px;
  text-decoration: none;
  color: white;
  font-size: 16px;
}

h1 {
  font-size: 2.5em;
  margin: 0.5em 0;
}

button {
  background-color: #4caf50;
  border: none;
  color: white;
  padding: 10px;
  text-align: center;
  font-size: 16px;
  margin: 5px;
  cursor: pointer;
}

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

footer {
  background-color: #ddd;
  text-align: center;
  padding: 10px 0;
  position: fixed;
  bottom: 0;
  width: 100%;
}