Dear @Sarahstaal
You can give a class or an id to the thumbnail collection news or show, depending on how long you want the line to be. If you do that, only the element you call would have the line.
Then the code would look like this :
.news .thumbs-collection-region {
border-right: 1px solid black;
padding-right: 20px;
}
Screenshot 2020-06-19 at 14.39.05.png
Let me know if you need more help with that.
Best,
Audrey