Why are my thumbnails stacking vertically? How do I get them to stack horizontally?

Help!!! On my portfolio page I finally got some thumbnails on top of my background image but they are stacked vertically? Why??
Here is the link

You are using Bootstrap’s row and col-* classes to put your thumbnails in a grid. You can add the Bootstrap library in CodePen by clicking Settings -> CSS -> quickadd -> Bootstrap3.
You should also remove the padding: 600px from your .wrapper class because it doesn’t leave any space for the thumbnails. You probably want margin: 600px instead (although that isn’t really best practice for a responsive design). Btw, nice username!

Hmmm I tried margin first without adding padding…I’ll try that again. Thanks for the help. I randomly chose X11 for no reason whatsoever.