How to avoid auto generated div classes in CQ?

Hi, I have created component called "union". When I drag that component into my parsys, It automatically generates one div class as 'union section'. I understand that CQ takes that component name and append 'section' string for auto generate div class.
For instance
<div class="union section">..</div>

Here I do not want auto generated div class. Is there any way to avoid or skip those auto-generated class in CQ?

How to avoid auto generated div classes?