Remove featured image hover effect from single blog post

Hello,

I’m looking to make a very plain and simple featured image for blog posts. I’m using the following CSS to make the image smaller and to remove the “+” sign:

.single .post-featured-image { width: 40%; float: left; margin-right: 30px; background-image: none; }

How can I remove the hover effect from the image so that when someone mouses over the image nothing happens?

Thank you!