I have the following HTML
<div class="class1">
    <div class="class2">
    <div class="class3 subclass1">
        Test
    </div>
</div>
</div>
and I need to add the CSS:
background-color: yellow;
to the div with class class1 that has a child div with class class3 subclass1. Cannot just add the CSS to the class1 as there could be more than one div with class of class1. 
Is that possible with just CSS?
 
     
    