LegendBorder

As of Version 9, all the functionality of the PlotLegends package is built into the Wolfram System. »

LegendBorder

is an option for Legend that specifies the style of the line surrounding key boxes and text in a legend.

Details and Options

To use LegendBorder, you first need to load the Plot Legends Package using Needs["PlotLegends`"].
LegendBorder->style specifies that the border line style should use the specified graphics directive or list of directives.

Wolfram Language code: Needs["PlotLegends`"]

Use a black border around the legend:

Wolfram Language code: Plot[{Sin[x], Cos[x]}, {x, 0, 2Pi}, PlotLegend -> {"sine", "cosine"}, LegendBorder -> Black]

Use a thick purple border around the legend:

Wolfram Language code: Plot[{Sin[x], Cos[x]}, {x, 0, 2Pi}, PlotLegend -> {"sine", "cosine"}, LegendBorder -> Directive[Thick, Purple]]

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