<h1>猫猫</h1>
<h2>果果</h2>
<p>果果真可爱！</p>
<h2>科科</h2>
<p>科科也好可爱！</p>
<h3>不妨再多试试</h3>
<h4>其实还有更小的</h4>
<h5>还能更小</h5>
<h6>不能再小了</h6>
External CSS
This Pen doesn't use any external CSS resources.
External JavaScript
This Pen doesn't use any external JavaScript resources.