Get Or Find Element in DOM by multiple attributes, role and class

<div id="mydiv">mydiv
<div role="complementary" class="nH abC">myclass1</div>
<div role="complementary" class="nB abd">myclass2</div>
</div>


$(".nH").css('background-color','red');
$('complementary, .abC').css('background-color','green');