Board Thread:Support Requests - Getting Technical/@comment-26978548-20161223180905/@comment-23989026-20161223201649

A template is 2 parts
 * 1) The template with its layout like border, background-color
 * 2) The template used on pages

As 2 is used on 1, it creates a loop.

Wookiepedia uses complex templates. Community Central has Template:Notice which might be more suitable