diff --git a/mod/book/pix/nav_exit.svg b/mod/book/pix/nav_exit.svg
index 9c165a90544..60f23ea46f8 100644
--- a/mod/book/pix/nav_exit.svg
+++ b/mod/book/pix/nav_exit.svg
@@ -6,7 +6,7 @@
 <svg version="1.1"
 	 xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:a="http://ns.adobe.com/AdobeSVGViewerExtensions/3.0/"
 	 x="0px" y="0px" width="16px" height="16px" viewBox="-0.2 -0.3 16 16"
-	 style="overflow:visible;enable-background:new -0.2 -0.3 16 16;" xml:space="preserve">
+	 style="overflow:visible;enable-background:new -0.2 -0.3 16 16;" xml:space="preserve" preserveAspectRatio="xMinYMid meet">
 <defs>
 </defs>
 <path style="fill:#999999;" d="M6.9,0.7c0.5-1,1.3-1,1.8,0l6.7,12.9c0.5,1,0,1.8-1.1,1.8h-13c-1.1,0-1.6-0.8-1.1-1.8L6.9,0.7z"/>
diff --git a/mod/book/pix/nav_next.svg b/mod/book/pix/nav_next.svg
index 1d2d9f915d0..7bceca82823 100644
--- a/mod/book/pix/nav_next.svg
+++ b/mod/book/pix/nav_next.svg
@@ -6,7 +6,7 @@
 <svg version="1.1"
 	 xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:a="http://ns.adobe.com/AdobeSVGViewerExtensions/3.0/"
 	 x="0px" y="0px" width="16px" height="16px" viewBox="-0.2 -0.2 16 16"
-	 style="overflow:visible;enable-background:new -0.2 -0.2 16 16;" xml:space="preserve">
+	 style="overflow:visible;enable-background:new -0.2 -0.2 16 16;" xml:space="preserve" preserveAspectRatio="xMinYMid meet">
 <defs>
 </defs>
 <path style="fill:#999999;" d="M14.7,6.9c1,0.5,1,1.3,0,1.8L1.8,15.4c-1,0.5-1.8,0-1.8-1.1v-13c0-1.1,0.8-1.6,1.8-1.1L14.7,6.9z"/>
diff --git a/mod/book/pix/nav_next_dis.svg b/mod/book/pix/nav_next_dis.svg
index 7e16572e72e..308a315fd6a 100644
--- a/mod/book/pix/nav_next_dis.svg
+++ b/mod/book/pix/nav_next_dis.svg
@@ -6,7 +6,7 @@
 <svg version="1.1"
 	 xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:a="http://ns.adobe.com/AdobeSVGViewerExtensions/3.0/"
 	 x="0px" y="0px" width="16px" height="16px" viewBox="0 -0.2 16 16" style="overflow:visible;enable-background:new 0 -0.2 16 16;"
-	 xml:space="preserve">
+	 xml:space="preserve" preserveAspectRatio="xMinYMid meet">
 <defs>
 </defs>
 <path style="fill:#999999;" d="M15,6.9L1.9,0.2C0.9-0.3,0,0.2,0,1.3v13c0,1.1,0.9,1.6,1.9,1.1L15,8.7C15.9,8.2,16,7.4,15,6.9z
diff --git a/mod/book/pix/nav_prev.svg b/mod/book/pix/nav_prev.svg
index 0d657d8a7b2..d1a828b37e5 100644
--- a/mod/book/pix/nav_prev.svg
+++ b/mod/book/pix/nav_prev.svg
@@ -6,7 +6,7 @@
 <svg version="1.1"
 	 xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:a="http://ns.adobe.com/AdobeSVGViewerExtensions/3.0/"
 	 x="0px" y="0px" width="16px" height="16px" viewBox="-0.3 -0.2 16 16"
-	 style="overflow:visible;enable-background:new -0.3 -0.2 16 16;" xml:space="preserve">
+	 style="overflow:visible;enable-background:new -0.3 -0.2 16 16;" xml:space="preserve" preserveAspectRatio="xMinYMid meet">
 <defs>
 </defs>
 <path style="fill:#999999;" d="M0.7,6.9c-1,0.5-1,1.3,0,1.8l12.9,6.7c1,0.5,1.8,0,1.8-1.1v-13c0-1.1-0.8-1.6-1.8-1.1L0.7,6.9z"/>
diff --git a/mod/book/pix/nav_prev_dis.svg b/mod/book/pix/nav_prev_dis.svg
index 27dedcad578..db38b4388b5 100644
--- a/mod/book/pix/nav_prev_dis.svg
+++ b/mod/book/pix/nav_prev_dis.svg
@@ -6,7 +6,7 @@
 <svg version="1.1"
 	 xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:a="http://ns.adobe.com/AdobeSVGViewerExtensions/3.0/"
 	 x="0px" y="0px" width="16px" height="16px" viewBox="-0.3 -0.2 16 16"
-	 style="overflow:visible;enable-background:new -0.3 -0.2 16 16;" xml:space="preserve">
+	 style="overflow:visible;enable-background:new -0.3 -0.2 16 16;" xml:space="preserve" preserveAspectRatio="xMinYMid meet">
 <defs>
 </defs>
 <path style="fill:#999999;" d="M13.8,0.2L0.7,6.9c-1,0.5-1,1.3,0,1.8l13.1,6.7c1,0.5,1.9,0,1.9-1.1v-13C15.7,0.2,14.8-0.3,13.8,0.2z
diff --git a/mod/book/tool/print/pix/book.svg b/mod/book/tool/print/pix/book.svg
index f05747b1296..92c3783ec59 100644
--- a/mod/book/tool/print/pix/book.svg
+++ b/mod/book/tool/print/pix/book.svg
@@ -6,7 +6,7 @@
 <svg version="1.1"
 	 xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:a="http://ns.adobe.com/AdobeSVGViewerExtensions/3.0/"
 	 x="0px" y="0px" width="16px" height="16px" viewBox="0 0 16 16" style="overflow:visible;enable-background:new 0 0 16 16;"
-	 xml:space="preserve">
+	 xml:space="preserve" preserveAspectRatio="xMinYMid meet">
 <defs>
 </defs>
 <path style="fill:#999999;" d="M4,16H0V2l2-2h8.5C11.3,0,12,0.7,12,1.5V4h-1V2.5C11,1.7,10.3,1,9.5,1H3.1l-1,1h6.4
diff --git a/mod/book/tool/print/pix/chapter.svg b/mod/book/tool/print/pix/chapter.svg
index df78a8701da..eeb2044e491 100644
--- a/mod/book/tool/print/pix/chapter.svg
+++ b/mod/book/tool/print/pix/chapter.svg
@@ -6,7 +6,7 @@
 <svg version="1.1"
 	 xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:a="http://ns.adobe.com/AdobeSVGViewerExtensions/3.0/"
 	 x="0px" y="0px" width="16px" height="16px" viewBox="0 0 16 16" style="overflow:visible;enable-background:new 0 0 16 16;"
-	 xml:space="preserve">
+	 xml:space="preserve" preserveAspectRatio="xMinYMid meet">
 <defs>
 </defs>
 <path style="fill:#999999;" d="M4,12c-2,0-4,1.2-4,1.2L0,1.1c0,0,2-1.1,4-1.1S7.1,0.5,8,1c0.9-0.5,2-1,4-1s4,1.1,4,1.1v9.6