'Column width in html table is wrongly expanded

The width of first column in the html file(see Book1.zip) is defined in col tag of colgroup, also it is defined in the first row in tr tag. But the width of first column expands a lot comparing the desired 145px. see srceenshot: column width expands a lot

Why the column width expands so much? And how to fix the column width to the desired '145px'?



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