How can I make my featured image spin?

I’m using a wordpress blog attached to my Showit site.
I’ve got a blog post on making images spin.
How can I apply the code to my featured image so it spins too?
Preferably without a plugin I’m limited with number of plugins with my package.
This is the spinning image on the post:
Blog post with spinning image

And this is the code I’m using to do it:

<div style="text-align: center;"> <img class="logo" src="">

Thank you!

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