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Jason B.
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You are looking to modify the EdgeForm of your barsChartStyle, and this is shown in the documentation for Histogram, in the Options section.

SeedRandom[42];
data = RandomVariate[NormalDistribution[0, 1], 200];
Histogram[data, 
 ChartStyle -> {EdgeForm[
    Directive[AbsoluteThickness[2], Black, Opacity[1]]]}]

enter image description here

You are looking to modify the EdgeForm of your bars,

SeedRandom[42];
data = RandomVariate[NormalDistribution[0, 1], 200];
Histogram[data, 
 ChartStyle -> {EdgeForm[
    Directive[AbsoluteThickness[2], Black, Opacity[1]]]}]

enter image description here

You are looking to modify the EdgeForm of your ChartStyle, and this is shown in the documentation for Histogram, in the Options section.

SeedRandom[42];
data = RandomVariate[NormalDistribution[0, 1], 200];
Histogram[data, 
 ChartStyle -> {EdgeForm[
    Directive[AbsoluteThickness[2], Black, Opacity[1]]]}]

enter image description here

Source Link
Jason B.
  • 70.2k
  • 3
  • 144
  • 298

You are looking to modify the EdgeForm of your bars,

SeedRandom[42];
data = RandomVariate[NormalDistribution[0, 1], 200];
Histogram[data, 
 ChartStyle -> {EdgeForm[
    Directive[AbsoluteThickness[2], Black, Opacity[1]]]}]

enter image description here