Edit in JSFiddle

<main class="section-element">
	Sektsioonielement (ehk ka plokkelement)
	<div class="sub-section-element">
		(Alam)sektsioonielement (ehk ka plokkelement)
		<p class="block-element">
			Plokkelement
			<b class="inline-element">Siselement</b>
		</p>
	</div>
</main>
*{
	padding: 10px;
}
.section-element{
	background-color: #4e9a26;
}

.sub-section-element{
	background-color: #ebc621;
}

.block-element{
	background-color: #1a5ab6;
}

.inline-element{
	padding: 0;
	background-color: #c1dde0;
}