<section class="featured video">
<h1>VIDEO</h1>
</section>
<section class="featured module">
<h1>NOT A VIDEO</h1>
</section>
<section class="featured module">
<h1>NOT A VIDEO</h1>
</section>
<section class="featured module">
<h1>NOT A VIDEO (3)</h1>
</section>
<section class="featured module">
<h1>NOT A VIDEO</h1>
</section>
<section class="featured module">
<h1>NOT A VIDEO</h1>
</section>
<section class="featured module">
<h1>NOT A VIDEO (6)</h1>
</section>
section.module:nth-child(1) => 會選到 <section class="featured video">
class無用