Board Thread:Support Requests - Getting Technical/@comment-28712089-20170717185025/@comment-168424-20170718010424

There are somewhat less complicated versions of the meta Navbox on Templates wiki, like Template:Navbox. You could copy it and start modifying it to your needs. You will have to get pretty deep into the wikitext and CSS weeds, though.

Here's the diff to add a border around your sandbox navbox.