highcharts stacked column draw horizontal line - highcharts

I need to draw horizontal line on highcharts stacked column as image below
In image Bold black line is showing, I need to draw same, however Bar color opacity changes when it split columns.

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Click to the color mark and change the border from "Automatic" to the color you want for the borders :)

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I am using Highcharts for one of my project. Everything is okay except I could not change line style('Solid','ShortDash','ShortDot','ShortDashDot','ShortDashDotDot','Dot','Dash','LongDash','DashDot','LongDashDot','LongDashDotDot') of bottom grid line in x axis as shown in the attached image.
Because the line you highlighted is not a gridLine of yAxis and dash style does not apply to it. In fact it covers the bottom-most grid line. Disable it by setting its width to 0.
API Reference:
http://api.highcharts.com/highcharts/xAxis.lineWidth
http://api.highcharts.com/highcharts/yAxis.gridLineDashStyle
Example:
http://jsfiddle.net/mnp6xa57/

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I am working on an implementation of CorePlot that uses a chart with all white elements on a black view.
The chart is coming along nicely, but I cannot get my axis increment labels to be the correct color. To clarify, the labels for the axis are correct (time and usage) but the labels on the axis tick marks are still in black.
What I currently see:
Changing my view background to white to confirm that the tick labels are there:
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titleTextStyle: text style for the axis title
labelTextStyle: text style for the labels at the major tick locations
minorTickLabelTextStyle: text style for the labels at the minor tick locations
axisLineStyle: line style for the axis line
majorTickLineStyle: line style for the tick marks at the major tick locations
minorTickLineStyle: line style for the tick marks at the minor tick locations
majorGridLineStyle: line style for the grid lines at the major tick locations
minorGridLineStyle: line style for the grid lines at the minor tick locations

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