How to add shadow or border on donut chart using Chartist - donut-chart

I am using a Chartist chart for showing data. I want to add a shadow on the selected slice of the chart on hover or mouse enter event. Attache below screenshot for the output
enter image description here
Attache below screenshot for the output
enter image description here

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We are developing an azure devops custom extension for boards, where we need to make some field as required based on some condition. We can display an error message and disable the save button, but how to show red color icon on that field??

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