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## Description
Shows how to use `add_border` to add a border to four edges of the selected cell range.
## Code
```ruby
p = Axlsx::Package.new
wb = p.workbook
wb.add_worksheet do |sheet|
sheet.add_row
sheet.add_row ["", "Product", "Category", "Price"]
sheet.add_row ["", "Butter", "Dairy", 4.99]
sheet.add_row ["", "Bread", "Baked Goods", 3.45]
sheet.add_row ["", "Broccoli", "Produce", 2.99]
sheet.add_border "B2:D5"
sheet.add_border "B3:D3", { edges: [:top], style: :thick }
sheet.add_border ["C3:C4", "D3:D4"]
end
p.serialize "add_border.xlsx"
```
## Output
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