<p>↓この間に水平線を挿入↓</p>
<hr>
<p>↑この間に水平線を挿入↑</P>
External CSS
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<p>↓この間に水平線を挿入↓</p>
<hr>
<p>↑この間に水平線を挿入↑</P>
This Pen doesn't use any external CSS resources.
This Pen doesn't use any external JavaScript resources.