The navigation panel information box icon is smaller than expected

This was first spotted on our CI. The only condition to reproduce this issue from a standard distribution is to change the icon Theme to Silk.

It seems that the style of the icon in this box gets impacted by the column layout used here. This column layout is hardcoded to use bootstrap columns. Those are based on a floating disposition of items.

I could not reproduce a similar issue using the XWiki Velocity macro `container` (which is the standard way to get columns in XWiki AFAIK).