Board Thread:Support Requests - Getting Technical/@comment-24741716-20151106120725/@comment-4731443-20151106133210

has no effect on images. You should use: |

As for column width, it seems to be adjusting to the size of your header images. If you use text instead (which I would recommend for scalability, especially on mobile), its size should become tied to the screen size and result in columns that are no wider than they need to be.