<style>
	.demo_css_sprt, .demo_css_sprt div	{
		background: white;
		border: 1px dotted red;
		padding: 1em;
	}
	.demo_css_sprt div	{
		margin: 1em 0;
	}
	.demo_css_sprt div:nth-of-type(2)	{
		background: mistyrose;
	}
	.demo_css_sprt p	{
		background: white;
		border: 1px dashed blue;
		padding: 1em;
	}
</style>
<div class="demo_css_sprt">
	<div>
	要素1
		<div>要素2</div>
		<div>要素3</div>
		<div>要素4</div>
		<div>要素5</div>
	</div>
	<p>要素6</p>
	<div>
	要素7
		<p>要素8</p>
		<div>要素9</div>
		<p>要素10</p>
		<div>要素11</div>
		<p>要素12</p>
	</div>
	<div>要素13</div>
</div>