body {
  font-family: Arial, sans-serif;
  margin: 0;
  background-color: #f4f6f7;
}

header {
  background-color: #2b7a78;
  color: white;
  padding: 20px;
  text-align: center;
}

nav {
  background-color: #17252a;
  padding: 10px;
}

nav a {
  color: white;
  margin-right: 15px;
  text-decoration: none;
}

section {
  padding: 20px;
}

button {
  background-color: #3aafa9;
  color: white;
  border: none;
  padding: 10px 15px;
}