body {
    margin: 0 auto;
    max-width: 60em;
  }

  h1,h2,h3,h4,h5,h6{
    text-align: center;
  }

  caption{
    display: table-caption;
    text-align: center;
    font-style: italic;
  }

  figcaption{
    text-align: center;
    font-style: italic;
  }

  p{
    text-align: justify;
    text-justify: inter-word;
  }

  div.parent {
    text-align: center;
  }
  
  ul { 
    display: inline-block; 
    text-align: left; 
  }

  ul.no-bullets {
    list-style-type: none;
  }
  
  .topnav {
    overflow: hidden;
    background-color: #333333;
    }

  .topnav a {
    float: left;
    color: #f2f2f2;
    text-align: center;
    padding: 16px 16px;
    text-decoration: none;
    font-size: 17px;
    }

  .topnav a:hover {
    background-color: #9813c0;
    color: #000000;
    }

  .topnav a.active {
    background-color: #10e0ac;
    color: #000000;
    }

  .dropdown {
    float: left;
    overflow: hidden;
  }
  
  .dropdown .dropbtn {
    font-size: 16px;  
    border: none;
    outline: none;
    color: #f2f2f2;
    padding: 16px 10px;
    background-color: inherit;
    font-family: inherit;
    margin: 0;
  }
  


  .topnav button.active{
    background-color: #10e0ac;
    color: #000000;
  }

  .navbar a:hover, .dropdown:hover .dropbtn {
    background-color: #9813c0;
    color: #000000;
  }
  
  .dropdown-content {
    display: none;
    position: absolute;
    background-color: #e095f7;
    min-width: 160px;
    box-shadow: 0px 8px 16px 0px #00000033;
    z-index: 1;
  }
  
  .dropdown-content a {
    float: none;
    color: #000000;
    padding: 12px 16px;
    text-decoration: none;
    display: block;
    text-align: left;
  }
  
  .dropdown-content a:hover {
    background-color: #9813c0;
    color: #000000;
  }
  
  .dropdown:hover .dropdown-content {
    display: block;
  }


  table, td{
      border: 1px solid black;
      border-collapse: collapse;
      margin-top: 2em;
      margin-bottom: 2em;  
  }
  td{
      text-align: center;
      padding: 8px;
  }
  tr{
      padding: 10px;
  }
     
  .center {
      margin-left: auto;
      margin-right: auto;
    }    

    fieldset{
      border: 1px solid #000000;
      width: 400px;
      margin: 0 auto;
    }

    .rotateimg90 {
      -webkit-transform:rotate(90deg);
      -moz-transform: rotate(90deg);
      -ms-transform: rotate(90deg);
      -o-transform: rotate(90deg);
      transform: rotate(90deg);
    }

    .rotateimg180 {
      -webkit-transform:rotate(180deg);
      -moz-transform: rotate(180deg);
      -ms-transform: rotate(180deg);
      -o-transform: rotate(180deg);
      transform: rotate(180deg);
    }

    .rotateimg270 {
      -webkit-transform:rotate(270deg);
      -moz-transform: rotate(270deg);
      -ms-transform: rotate(270deg);
      -o-transform: rotate(270deg);
      transform: rotate(270deg);
    }

    .centerImg {
      display: block;
      margin-left: auto;
      margin-right: auto;
      width: 50%;
    }
    
    .centerIframe{
      width: 700px;
      height: 700px;
      margin: 0 auto;
      display: block;
    }

    .collapsible {
      background-color: #ffffff;
      color: #000000;
      cursor: pointer;
      padding: 18px;
      width: 100%;
      border: none;
      text-align: center;
      outline: none;
      font-size: 15px;
      display: block;
      margin-left: auto;
      margin-right: auto;
    }
    
    .active, .collapsible:hover {
      background-color: #9813c0;
    }
    
    .content {
      padding: 0 18px;
      display: none;
      overflow: hidden;
      background-color: #dfdfdf;
    }

    .animated-grid {
      height: 85vh;
      margin-bottom: 200px;
    
      display: grid;
      gap: 1rem;
    
      /* Explicit grid */
      grid-template-areas:
        'a  b  c  d'
        'l  🌟 🌟 e'
        'k  🌟 🌟 f'
        'j  i  h  g';
    
      grid-template-rows: repeat(4, 25%);
      grid-template-columns: 240px auto auto 240px;
    
      --stagger-delay: 100ms;
    }
    
    @keyframes cardEntrance {
      from {
        opacity: 0;
        transform: scale(0.3);
        filter: hue-rotate(180deg);
      }
      to {
        opacity: 1;
        transform: scale(1);
        filter: hue-rotate(0deg);
      }
    }
    
    .card {
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      font-size: 3rem;
      color: #fff;
      background-color: #10e0ac;
      animation: cardEntrance 700ms ease-out;
      animation-fill-mode: backwards;
    }
    
    .card:nth-child(1) {
      grid-area: a;
      animation-delay: calc(1 * var(--stagger-delay));
    }
    .card:nth-child(2) {
      grid-area: b;
      animation-delay: calc(2 * var(--stagger-delay));
    }
    .card:nth-child(3) {
      grid-area: c;
      animation-delay: calc(3 * var(--stagger-delay));
    }
    .card:nth-child(4) {
      grid-area: d;
      animation-delay: calc(4 * var(--stagger-delay));
    }
    .card:nth-child(5) {
      grid-area: e;
      animation-delay: calc(5 * var(--stagger-delay));
    }
    .card:nth-child(6) {
      grid-area: f;
      animation-delay: calc(6 * var(--stagger-delay));
    }
    .card:nth-child(7) {
      grid-area: g;
      animation-delay: calc(7 * var(--stagger-delay));
    }
    .card:nth-child(8) {
      grid-area: h;
      animation-delay: calc(8 * var(--stagger-delay));
    }
    .card:nth-child(9) {
      grid-area: i;
      animation-delay: calc(9 * var(--stagger-delay));
    }
    .card:nth-child(10) {
      grid-area: j;
      animation-delay: calc(10 * var(--stagger-delay));
    }
    .card:nth-child(11) {
      grid-area: k;
      animation-delay: calc(11 * var(--stagger-delay));
    }
    .card:nth-child(12) {
      grid-area: l;
      animation-delay: calc(12 * var(--stagger-delay));
    }
    .card:last-child {
      grid-area: 🌟;
      animation-delay: calc(13 * var(--stagger-delay));
    }

    #B2topBtn {
      display: none; /* Hidden by default */
      position: fixed; /* Fixed/sticky position */
      bottom: 20px; /* Place the button at the bottom of the page */
      right: 30px; /* Place the button 30px from the right */
      z-index: 99; /* Make sure it does not overlap */
      border: none; /* Remove borders */
      outline: none; /* Remove outline */
      background-color: #10e0ac; /* Set a background color */
      color: white; /* Text color */
      cursor: pointer; /* Add a mouse pointer on hover */
      padding: 15px; /* Some padding */
      border-radius: 10px; /* Rounded corners */
      font-size: 18px; /* Increase font size */
    }
    
    #B2topBtn:hover {
      background-color: #9813c0; /* Add a dark-grey background on hover */
    }