See how to insert border in Excel by using the predefined options and create your custom cell border style.
How to Add Borders in Excel
java - Apache POI set cell border is not working - Stack Overflow
How to Add Borders in Excel
Apply or remove cell borders on a worksheet - Microsoft Support
Apply or remove cell borders on a worksheet - Microsoft Support
How to create cell border in Excel
How to create cell border in Excel
Excel: How To Add And Create Borders
Apply or remove cell borders on a worksheet - Microsoft Support
Apply or remove cell borders on a worksheet - Microsoft Support