Added pdfPreviewPageDecoration, scrollViewDecoration properties to PDFPreview Widget.

 # Changelog
 
+## 3.5.0
+
+- Add decoration options to the PdfPreview Widget [Marcos Rodriguez]
+
 ## 3.4.0
 
 - Add PdfPreview Widget

@@ -26,6 +26,8 @@ class PdfPreview extends StatefulWidget {
     this.onError,
     this.onPrinted,
     this.onShared,
+    this.scrollViewDecoration,
+    this.pdfPreviewPageDecoration,
   }) : super(key: key);
 
   /// Called when a pdf document is needed
@@ -61,6 +63,12 @@ class PdfPreview extends StatefulWidget {
   /// Called if the user shares the pdf document
   final void Function(BuildContext context) onShared;
 
+  /// Decoration of scrollView
+  final Decoration scrollViewDecoration;
+
+  /// Decoration of _PdfPreviewPage
+  final Decoration pdfPreviewPageDecoration;
+
   @override
   _PdfPreviewState createState() => _PdfPreviewState();
 }
@@ -110,9 +118,15 @@ class _PdfPreviewState extends State<PdfPreview> {
     await for (final PdfRaster page in Printing.raster(_doc, dpi: dpi)) {
       setState(() {
         if (pages.length <= pageNum) {
-          pages.add(_PdfPreviewPage(page: page));
+          pages.add(_PdfPreviewPage(
+            page: page,
+            pdfPreviewPageDecoration: widget.pdfPreviewPageDecoration,
+          ));
         } else {
-          pages[pageNum] = _PdfPreviewPage(page: page);
+          pages[pageNum] = _PdfPreviewPage(
+            page: page,
+            pdfPreviewPageDecoration: widget.pdfPreviewPageDecoration,
+          );
         }
       });
 
@@ -220,7 +234,8 @@ class _PdfPreviewState extends State<PdfPreview> {
     final theme = Theme.of(context);
 
     final Widget scrollView = Container(
-      decoration: BoxDecoration(
+      decoration: widget.scrollViewDecoration ??
+          BoxDecoration(
             gradient: LinearGradient(
               colors: <Color>[Colors.grey.shade400, Colors.grey.shade200],
               begin: Alignment.topCenter,
@@ -380,9 +395,11 @@ class _PdfPreviewPage extends StatelessWidget {
   const _PdfPreviewPage({
     Key key,
     this.page,
+    this.pdfPreviewPageDecoration,
   }) : super(key: key);
 
   final PdfRaster page;
+  final Decoration pdfPreviewPageDecoration;
 
   @override
   Widget build(BuildContext context) {
@@ -395,7 +412,8 @@ class _PdfPreviewPage extends StatelessWidget {
         right: 8,
         bottom: 12,
       ),
-      decoration: const BoxDecoration(
+      decoration: pdfPreviewPageDecoration ??
+          const BoxDecoration(
             color: Colors.white,
             boxShadow: <BoxShadow>[
               BoxShadow(

@@ -4,7 +4,7 @@ description: Plugin that allows Flutter apps to generate and print documents to
 homepage: https://github.com/DavBfr/dart_pdf/tree/master/printing
 repository: https://github.com/DavBfr/dart_pdf
 issue_tracker: https://github.com/DavBfr/dart_pdf/issues
-version: 3.4.0
+version: 3.5.0
 
 environment:
   sdk: ">=2.3.0 <3.0.0"