<style>
	.someClass {
		background: lawngreen;
	}
</style>

<nav class="mdl-navigation">
	<a class="mdl-navigation__link" href="#">Nav link 1</a>
	<a class="mdl-navigation__link" href="#">Nav link 2</a>
	<a class="mdl-navigation__link" href="#">Nav link 3</a>
</nav>
