color is passed to the css background-color property of the color box. The optional outline parameter is the color of the outline around the box. If you need to customize the border further, you can use the border argument, which overrides the outline argument and sets the css description (e.g., 1px solid #aaa) of the border that will be drawn around the box.
[[Image:Celts in Europe.png|200px|thumb|right|The Celts in Europe, past and present:
{{legend|#1a8000|present-day Celtic-speaking areas}}
{{legend|#27c600|other parts of the six most commonly recognized 'Celtic nations' and where a
Celtic language is spoken but not the dominating language}}
{{legend|#97ffb6|other parts of Europe once peopled by Celts; modern-day inhabitants of many of
these areas often claim a Celtic heritage and/or culture}}
{{legend|yellow|the core Hallstatt territory, expansion before 500 BC}}
]]
The Celts in Europe, past and present:
present-day Celtic-speaking areas
other parts of the six most commonly recognized 'Celtic nations' and where a Celtic language is spoken but not the dominating language
other parts of Europe once peopled by Celts; modern-day inhabitants of many of these areas often claim a Celtic heritage and/or culture
the core Hallstatt territory, expansion before 500 BC
See also
For a version of this template using display:inline to avoid line breaks after each legend, see {{Legend inline}}.
For a version of this template without block formatting, see {{Legend2}}.
For legend rows representing lines, see {{legend-line}}.
