Remove background color change after page loading

In Discourse, when one opens a page with a single topic, the background color of the topic text changes in a few seconds after the page loads. (Usually from light blue to white). I would like to turn this feature off for one category, how can I do that?

I am using Material Design Theme with some customizations.

That can be done with CSS, so please read How to make CSS changes on your site.

The specific animation is defined on

https://github.com/discourse/discourse/blob/master/app/assets/stylesheets/common/base/topic-post.scss#L622

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