Thread:LightEcoSage/@comment-171752-20180717155105/@comment-171752-20180723173238

The Mbox template has several color options already coded, which can be seen here. The color on the left is set with the  input. For example,  displays yellow and   displays purple.

Using  as the base for other templates, like you're doing with Template:Stub using , allows you to easily display different colors on the left side.