.nav-link.active {
    background-color: #212121;
    color: #fff !important;
    border-radius: 20px;
    padding: 8px 20px;
  }
  
  .navbar-nav .nav-link {
    font-size: 1.1rem;
    margin-left: 15px;
    color: #333;
  }
  
  .hero img {
    max-height: 500px;
    object-fit: cover;
  }

html, body {
    height: 100%;
    margin: 0;
  }
  
  body {
    display: flex;
    flex-direction: column;
  }
  
  main {
    flex: 1;
  }