-header">Introduction</h5>
      <ul>
          <li><a href="index.html">Petal.less</a></li>
          <li><a href="variables.html">Customizing Settings</a></li>
          <li><a href="color-palette.html">Color Palette</a></li>
          <li><a href="javascript.html">JavaScript Functions</a></li>
          <li><a href="dark-mode.html">Dark Mode</a></li>
      </ul>

      <h5 class="list-header">Components</h5>
      <ul>
          <li class="active"><a href="basic.html">Basic</a></li>
          <li><a href