How i can add background color to highcharts stacked Bar Chart column like in picture

I have try find in highcharts official documentation but unfortunately cant find.
How i can add background color to highcharts stacked Bar Chart column like in picture

I have try find in highcharts official documentation but unfortunately cant find.
There is no straight way from the API to create such a shadow background for a stacked bar chart, but you can create it as a dummy series with disabled enableMouseTracking and showInLegend options.
Sample code:
plotOptions: {
bar: {
stacking: 'percent'
}
},
series: [{
color: '#ddd',
enableMouseTracking: false,
showInLegend: false,
data: [7, 7]
}, {
data: [1, 1]
},
{
data: [2, 2]
}
]
Demo: http://jsfiddle.net/BlackLabel/82svfyxt/
API References: https://api.highcharts.com/highcharts/series.bar.showInLegend https://api.highcharts.com/highcharts/series.bar.enableMouseTracking