body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  background: #f9f9f9;
}
.nav-bar {
  background: #ffffff;
  padding: 1rem 2rem;
  border-bottom: 2px solid #ddd;
}
.nav-bar a {
  margin-right: 15px;
  text-decoration: none;
  color: #004b4b;
}
h1, h2 {
  margin-left: 2rem;
}
main {
  padding: 2rem;
}
footer {
  background: #004b4b;
  color: white;
  text-align: center;
  padding: 1rem;
  margin-top: 2rem;
}