diff --git a/internal/bot/export.go b/internal/bot/export.go
index c2b018e..6e7652d 100644
--- a/internal/bot/export.go
+++ b/internal/bot/export.go
@@ -81,6 +81,16 @@ func GenerateMonthlyReport(store *db.Store, userID int64, timezone, accent, cale
 		},
 		Alignment: &excelize.Alignment{Horizontal: "center", Vertical: "center"},
 	})
+	dayOffStyle, _ := f.NewStyle(&excelize.Style{
+		Fill: excelize.Fill{Type: "pattern", Pattern: 1, Color: []string{theme.totalFill}},
+		Border: []excelize.Border{
+			{Type: "left", Color: theme.border, Style: 1},
+			{Type: "right", Color: theme.border, Style: 1},
+			{Type: "top", Color: theme.border, Style: 1},
+			{Type: "bottom", Color: theme.border, Style: 1},
+		},
+		Alignment: &excelize.Alignment{Horizontal: "center", Vertical: "center"},
+	})
 
 	monthName := formatMonthTitle(calendar, calYear, calMonth)
 	f.SetCellValue(sheet, "A1", fmt.Sprintf("Work Time Report - %s", monthName))
@@ -192,6 +202,12 @@ func GenerateMonthlyReport(store *db.Store, userID int64, timezone, accent, cale
 		f.SetCellValue(sheet, cellBreak, fmtHHMM(breakSec))
 		f.SetCellStyle(sheet, cellBreak, cellBreak, dataStyle)
 
+		if hasDayOff {
+			cellA, _ := excelize.CoordinatesToCellName(1, row)
+			cellF, _ := excelize.CoordinatesToCellName(6, row)
+			f.SetCellStyle(sheet, cellA, cellF, dayOffStyle)
+		}
+
 		row++
 	}