body {
  font-family: Arial, sans-serif;
  background: #ffffff;
  color: #333;
  margin: 0;
  padding: 0;
}
h1, h2 {
  color: #00796b;
}
nav {
  background: #00796b;
  padding: 10px 0;
}
nav ul {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  padding: 0;
  margin: 0;
  list-style: none;
}
nav ul li {
  margin: 0 15px;
}
nav ul li a {
  color: white;
  text-decoration: none;
  font-weight: bold;
}