body {
  font-family: Arial, sans-serif;
  text-align: center;
  background-color: #f0f8ff;
  margin: 0;
  padding: 0;
}

header {
  background-color: #1e90ff;
  color: white;
  padding: 20px;
}

#logo {
  width: 100px;
  display: block;
  margin: 0 auto 10px;
}

button {
  padding: 10px 20px;
  font-size: 16px;
  cursor: pointer;
}