body {
    background-color: #121212;
    color: #f5f5f5;
  }
  
  h1 {
    font-family: 'Poppins', sans-serif;
    font-size: 2.5rem;
  }
  
  .card {
    background-color: #1f1f1f;
    border: none;
    position: relative;
    overflow: hidden;
    border-radius: 10px;
  }
  
  .card-img-top {
    border-radius: 10px;
    transition: opacity 0.3s ease;
  }
  
  /* Overlay to display achievement on hover */
  .card-body {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: rgba(0, 0, 0, 0.7); /* Semi-transparent background */
    opacity: 0;
    transition: opacity 0.3s ease;
  }
  
  .card:hover .card-body {
    opacity: 1; /* Show overlay on hover */
  }
  
  .card-title, .card-description {
    font-size: 1.2rem;
    font-weight: bold;
    color: #ffcc00;
    text-align: center;
  }
  
  .card-description {
    color: #ffffff;
    font-size: 1rem;
    width: 80%;
    text-align: center;
    padding: 10px;
  }
  
  .modal-content {
    border-radius: 15px;
  }
  
  .modal-header {
    border-bottom: none;
  }
  
  .modal-body img {
    max-height: 80vh;
  }
  
  .btn-close-white {
    filter: invert(1);
  }