CSS code snippet for blog layout...

Valued Support-Team,

your colleagues Kasia and Ash were once so kind giving us the css code snippet to suppress across our entire network all featured images like shown below:

.single .flexslider {
display: none;
}

Now we are wondering, please could you give us a similar code snippet about the layout for ALL POSTS across the entire network despite the content which will be displayed.

We have set for pages the layout which is 'page with sidebar' only but this does not apply to posts...

Thanks
Prinz

NS:
attached screenshot how it looks on pages also one how it looks currently on posts.