<fieldset id="mode-switcher">

  <legend>Select a color mode:</legend>

  <div>

    <input type="radio" id="auto" name="mode" value="auto" checked />

    <label for="auto">Auto</label>

  </div>

  <div>

    <input type="radio" id="light" name="mode" value="light" />

    <label for="light">Light</label>

  </div>

  <div>

    <input type="radio" id="dark" name="mode" value="dark" />

    <label for="dark">Dark</label>

  </div>

</fieldset>