body {
      font-family: sans-serif;
      margin: 0;
      background-color: #f0f0f0;
      display: flex;
      justify-content: center;
      align-items: center;
      min-height: 100vh;
      flex-direction: column; /* Center presentation and controls */
    }

    .presentation {
      width: 80%;
      max-width: 800px;
      height: 450px; /* Fixed height for slides */
      background-color: #fff;
      border: 1px solid #ccc;
      box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
      position: relative; /* Needed for absolute positioning of slides */
      overflow: hidden; /* Hide non-active slides */
    }

    .slide {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      padding: 40px;
      box-sizing: border-box;
      opacity: 0; /* Hide slides by default */
      visibility: hidden;
      transition: opacity 0.5s ease-in-out, visibility 0.5s ease-in-out;
      background-color: #fff; /* Ensure background covers previous slide */
      display: flex;
      flex-direction: column;
      justify-content: center; /* Center content vertically */
    }

    .slide.active {
      opacity: 1; /* Show active slide */
      visibility: visible;
      z-index: 1; /* Bring active slide to front */
    }

    .slide h1, .slide h2 {
      color: #333;
      margin-top: 0;
    }

    .slide ul {
      list-style: disc;
      margin-left: 20px;
    }

    .slide pre {
      background-color: #eee;
      padding: 15px;
      border-radius: 5px;
      overflow-x: auto;
      font-family: monospace;
    }

    .controls {
      margin-top: 20px;
      display: flex;
      gap: 10px; /* Space between buttons */
    }

    .controls button {
      padding: 10px 20px;
      font-size: 16px;
      cursor: pointer;
      background-color: #007bff;
      color: white;
      border: none;
      border-radius: 5px;
      transition: background-color 0.3s ease;
    }

    .controls button:hover {
      background-color: #0056b3;
    }

    .controls button:disabled {
      background-color: #ccc;
      cursor: not-allowed;
    }