<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	{
		background: mistyrose;
	}
	.demo_css_sprt p	{
		border: 1px dashed blue;
		padding: 1em;
	}
</style>
<div class="demo_css_sprt">
	要素1
	<div>要素2</div>
	<div>
		要素3
		<div>要素4</div>
	</div>
	<p>要素5</p>
</div>