Set cell backgrounds by createStyle not working

[lRoberth]

Describe the bug
Set cell backgrounds by createStyle not working

To Reproduce
Run next code
`var style = workbook.createStyle({
font: {
color: '#FF0800',
size: 12
},
numberFormat: '$#,##0.00; ($#,##0.00); -'
});

var style2 = workbook.createStyle({
fill: {
type: 'pattern',
pattern: 'solid',
fgColor: '#f20202', // Foreground color
bgColor: '#f20202', // Background color
},
font: {
color: '#10c8c8',
size: 10,
}
});

worksheet2.cell(1,1).string("#").style(style2);
worksheet2.cell(1,2).string("Full Legal Name").style(style);
worksheet2.cell(1,3).string("Job Title").style(style2);
worksheet2.cell(1,4).string("Market").style(style2);
worksheet2.cell(1,5).string("Location Type").style(style2);
worksheet2.cell(1,6).string("Termination Date").style(style2);

workbook.write('Excel.xlsx');`

This will not apply red colors to the cell at style2, it keeps it white.

Expected behavior
Color should be applied to cell

Environment (please complete the following information):

• OS: macOS Sonoma 14.1.1
• Node Version: v20.9.0
• excel4node Version: 1.8.2
• Application: Office 365
• Application Version (if applicable): Excel 16.79.23111614

Additional context
There are no environment errors

[Devidian]

I had a similar problem, but my cells used to stay black. I was looking for a reason and found this issue. Then i realized i missed to add fgColor to my style. I also see the problem in your case. It yould be patternType: 'solid' not just pattern. You might have solved this old issue i just wanted to note for any other that might stumble over it!