   body {
      background-color: #1f1f1f;
      color: #fff;
      transition: background-color 0.5s, color 0.5s;
    }

    .dark-mode {
      background-color: #1f1f1f;
      color: #fff;
    }

    .light-mode {
      background-color: #fff;
      color: #1f1f1f;
    }

    .toggle-button {
      position: absolute;
      top: 10px;
      right: 10px;
      background-color: #1f1f1f;
      color: #fff;
      border: none;
      padding: 10px;
      cursor: pointer;
    }

    .toggle-button:hover {
      background-color: #555;
    }