diff --git a/mod/assign/pix/layout-default.svg b/mod/assign/pix/layout-default.svg
index efe83a3d0d1..22f38456502 100644
--- a/mod/assign/pix/layout-default.svg
+++ b/mod/assign/pix/layout-default.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="M0,0v16h16V0H0z M2,14V2h6v12H2z M14,14h-4V2h4V14z"/>
diff --git a/mod/assign/pix/layout-expand-left.svg b/mod/assign/pix/layout-expand-left.svg
index da4667bd17b..a4f65dd3d20 100644
--- a/mod/assign/pix/layout-expand-left.svg
+++ b/mod/assign/pix/layout-expand-left.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="M0,0v16h16V0H0z M2,14V2h8v12H2z M14,14h-2V2h2V14z"/>
diff --git a/mod/assign/pix/layout-expand-right.svg b/mod/assign/pix/layout-expand-right.svg
index c963d11d308..44ecbdd3e41 100644
--- a/mod/assign/pix/layout-expand-right.svg
+++ b/mod/assign/pix/layout-expand-right.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="M0,0v16h16V0H0z M2,14V2h2v12H2z M14,14H6V2h8V14z"/>