How to hide a special post in the bloglist

I created the nice website
https://tennis.tus-bietigheim.de
for my tennis club using the theme twenty sixteen. On the starting page (page ID=40) there are arranged 4 thumbnails linked to the most actual themes, followed by the blog list using the „content views“ plugin (pt-cv-view ID=0e7aab3kcx).

As an additional feature I want to hide the thumbnail of one special post (here post ID=14515, the post width the animated gif) on horizontal screens of tablets or on PC screens (displaying widgets on the right side) using css code. The @Media function for this screen selection is working well - as example I built in black borders for smartphones and red borders for wide screens (just open the website and turn a tablet 90 degrees).

I tried a variety of css codes using

@Media screen and (min-width:55.875em) .post-14515 or .postid-14515 .pt-cv-thumbnail {display: none !important;}

of similar but I didn’t succeed to hide this special post.

What is the correct css code for hiding this special post?

Thanks for your help