diff --git a/structsect.go b/structsect.go
index f200cd3..4404c7f 100644
--- a/structsect.go
+++ b/structsect.go
@@ -1,85 +1,85 @@
-/*
-   Copyright (c) 2024 mabiao0525 (马飚)
-
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Affero General Public License as published
-   by the Free Software Foundation, either version 3 of the License, or
-   (at your option) any later version.
-
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU Affero General Public License for more details.
-
-   You should have received a copy of the GNU Affero General Public License
-   along with this program.  If not, see <https://www.gnu.org/licenses/>.
-*/
-
-package docx
-
-import (
-	"encoding/xml"
-	"io"
-	"strings"
-)
-
-// SectPr show the properties of the document, like paper size
-type SectPr struct {
-	XMLName xml.Name `xml:"w:sectPr,omitempty"` // properties of the document, including paper size
-	PgSz    *PgSz    `xml:"w:pgSz,omitempty"`
-}
-
-// PgSz show the paper size
-type PgSz struct {
-	W xml.Attr `xml:"w:w,attr"` // width of paper
-	H xml.Attr `xml:"w:h,attr"` // high of paper
-}
-
-// UnmarshalXML ...
-func (sect *SectPr) UnmarshalXML(d *xml.Decoder, _ xml.StartElement) error {
-	for {
-		t, err := d.Token()
-		if err == io.EOF {
-			break
-		}
-		if err != nil {
-			return err
-		}
-		if tt, ok := t.(xml.StartElement); ok {
-			switch tt.Name.Local {
-			case "pgSz":
-				var value PgSz
-				err = d.DecodeElement(&value, &tt)
-				if err != nil && !strings.HasPrefix(err.Error(), "expected") {
-					return err
-				}
-				sect.PgSz = &value
-			default:
-				err = d.Skip() // skip unsupported tags
-				if err != nil {
-					return err
-				}
-			}
-		}
-	}
-	return nil
-}
-
-// UnmarshalXML ...
-func (pgsz *PgSz) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
-	var err error
-
-	for _, attr := range start.Attr {
-		switch attr.Name.Local {
-		case "w":
-			pgsz.W = xml.Attr{Name: xml.Name{Local: "w:w"}, Value: attr.Value}
-		case "h":
-			pgsz.H = xml.Attr{Name: xml.Name{Local: "w:w"}, Value: attr.Value}
-		default:
-			//ignore other attributes now
-		}
-	}
-	// Consume the end element
-	_, err = d.Token()
-	return err
-}
+/*
+   Copyright (c) 2024 mabiao0525 (马飚)
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Affero General Public License as published
+   by the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Affero General Public License for more details.
+
+   You should have received a copy of the GNU Affero General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
+package docx
+
+import (
+	"encoding/xml"
+	"io"
+	"strings"
+)
+
+// SectPr show the properties of the document, like paper size
+type SectPr struct {
+	XMLName xml.Name `xml:"w:sectPr,omitempty"` // properties of the document, including paper size
+	PgSz    *PgSz    `xml:"w:pgSz,omitempty"`
+}
+
+// PgSz show the paper size
+type PgSz struct {
+	W xml.Attr `xml:"w:w,attr"` // width of paper
+	H xml.Attr `xml:"w:h,attr"` // high of paper
+}
+
+// UnmarshalXML ...
+func (sect *SectPr) UnmarshalXML(d *xml.Decoder, _ xml.StartElement) error {
+	for {
+		t, err := d.Token()
+		if err == io.EOF {
+			break
+		}
+		if err != nil {
+			return err
+		}
+		if tt, ok := t.(xml.StartElement); ok {
+			switch tt.Name.Local {
+			case "pgSz":
+				var value PgSz
+				err = d.DecodeElement(&value, &tt)
+				if err != nil && !strings.HasPrefix(err.Error(), "expected") {
+					return err
+				}
+				sect.PgSz = &value
+			default:
+				err = d.Skip() // skip unsupported tags
+				if err != nil {
+					return err
+				}
+			}
+		}
+	}
+	return nil
+}
+
+// UnmarshalXML ...
+func (pgsz *PgSz) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
+	var err error
+
+	for _, attr := range start.Attr {
+		switch attr.Name.Local {
+		case "w":
+			pgsz.W = xml.Attr{Name: xml.Name{Local: "w:w"}, Value: attr.Value}
+		case "h":
+			pgsz.H = xml.Attr{Name: xml.Name{Local: "w:w"}, Value: attr.Value}
+		default:
+			//ignore other attributes now
+		}
+	}
+	// Consume the end element
+	_, err = d.Token()
+	return err
+}