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## Description
There is a way to add styles to a whole column.
## Code
```ruby
require 'axlsx'
p = Axlsx::Package.new
wb = p.workbook
s = wb.styles
percent = s.add_style num_fmt: 9, bg_color: '0000FF'
wb.add_worksheet(name: 'Custom column types') do |sheet|
sheet.add_row ['A', 'B', 'Percent', 'Hidden', 'E']
sheet.add_row [1, 2, 0.3, 4, 5.0]
sheet.add_row [1, 2, 0.2, 4, 5.0]
sheet.add_row [1, 2, 0.1, 4, 5.0]
# Apply the percent style to the column at index 2 skipping the first row.
sheet.col_style 2, percent, row_offset: 1
sheet.column_info[3].hidden = true
end
p.serialize 'column_styles_example.xlsx'
```
## Output
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