はがき印字のターゲットを_blankへ

src/pages/dashboard/receipt-issuing-order/detail.tsx

@@ -234,7 +234,11 @@ export default function ReceiptIssuingOrderDetail() {
                   <SimpleDataList data={mailStatus2} />
                   <Divider />
                   <Stack direction="row" spacing={2} sx={{ px: 2 }}>
-                    <Button variant="contained" href={downloadUrl}>
+                    <Button
+                      variant="contained"
+                      href={downloadUrl}
+                      target="_blank"
+                    >
                       印字
                     </Button>