Add missing element `xfId` of the styles to fix issue #93.

1 files changed, 2 insertions, 0 deletions

diff --git a/styles.go b/styles.go
index 2e440c2..b359313 100644
--- a/styles.go
+++ b/styles.go
@@ -2122,6 +2122,8 @@ func setCellXfs(style *xlsxStyleSheet, fontID, numFmtID, fillID, borderID int, a
 	style.CellXfs.Count++
 	xf.Alignment = alignment
 	xf.ApplyAlignment = applyAlignment
+	xfID := 0
+	xf.XfID = &xfID
 	style.CellXfs.Xf = append(style.CellXfs.Xf, xf)
 	return style.CellXfs.Count - 1
 }