CSS styling issue

Hi! I got this site: https://www.karolinabrock.com

If you go to the styling link (in firefox) the thumbnails to the right looks in the same order as the thumbnail picuture on the first page https://www.karolinabrock.com/images/thumbnails2.jpg. But when i see it in safari for example, the list is not the same way. What have i done incorrectly? Should i order them by CSS instead, if so, how?

sorry for the silly question, thnx for the help!