* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Open Sans', sans-serif;
  }
  
  body {
    background-color: #212529;
    color: #f8f9fa;
  }
  
  .container {
    max-width: 800px;
  }
  
  .navflex {
    display: flex;
    flex-direction: row;
  }

  .nav-link {
    color: #f8f9fa;
    text-decoration: none;
    transition: all 0.3s ease-in-out;
  }
  
  .nav-link:hover {
    color: #fff;
    text-decoration: none;
    background-color: #343a40;
  }
  
  .list-group-item {
    background-color: #343a40;
    border-color: #343a40;
    color: #f8f9fa;
    transition: all 0.3s ease-in-out;
    padding: 1rem;
    margin-bottom: 0.5rem;
  }
  
  .list-group-item:hover {
    background-color: #4f5b62;
    border-color: #4f5b62;
    color: #fff;
  }
  
  a {
    color: #f8f9fa;
    text-decoration: none;
    transition: all 0.3s ease-in-out;
  }
  
  a:hover {
    color: #fff;
    text-decoration: none;
  }

  @media screen and (min-width: 992px) {
    img {
      width: 100%;
    }
    .navbar-collapse {
      position: absolute;
      top: 100%;
      left: 0;
      z-index: 1;
      display: none;
      float: none;
      width: 100%;
      padding-top: 0.5rem;
      background-color: #212529;
    }
    .navbar-collapse.show {
      display: block;
    }
    .navbar-nav .nav-item {
      float: none;
      margin-right: 0;
    }
    .navbar-nav .dropdown-menu {
      position: static;
      width: auto;
      margin-top: 0;
      background-color: transparent;
      border: none;
      box-shadow: none;
    }
  }
  
  .card-img-top {
    max-width: 100%;
    height: 400px;
    object-fit: cover;
  }
  
  .navbar-brand {
    font-size: 1.5rem;
    font-weight: bold;
  }
  
  img {
    max-width: 100%;
  }
  
  @media screen and (max-width: 991px) {
    .navbar-collapse {
      background-color: #212529;
      position: absolute;
      top: 56px;
      left: 0;
      width: 100%;
      z-index: 1000;
      padding: 10px;
      border-radius: 0 0 10px 10px;
      box-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
      transition: all 0.5s;
    }
  
    .navbar-collapse.show {
      height: 100%;
      z-index: 1000;
    }
  
    .navbar-nav {
      display: block;
      margin: 0;
      padding: 0;
      text-align: center;
    }
  
    .navbar-nav li {
      display: inline-block;
      margin: 10px 0;
    }
  
    .navbar-nav li a {
      display: block;
      padding: 10px;
      border-radius: 5px;
      color: #fff;
    }
  
    .navbar-dark .navbar-toggler {
      border-color: #fff;
    }
    .navbar-toggler {
        color: #fff;
    }
    .navbar-toggler span {
        background-color: #212529;
    }
}