diff --git a/appIcons.js b/appIcons.js
index 1ff3e0f..ddda78a 100644
--- a/appIcons.js
+++ b/appIcons.js
@@ -53,7 +53,7 @@ const _ = imports.gettext.domain(Utils.TRANSLATION_DOMAIN).gettext;
 
 let LABEL_GAP = 5;
 let MAX_INDICATORS = 4;
-const DEFAULT_PADDING_SIZE = 4;
+var DEFAULT_PADDING_SIZE = 4;
 
 let DOT_STYLE = {
     DOTS: "DOTS",
diff --git a/img/highlight_stacked_bg_left.svg b/img/highlight_stacked_bg_left.svg
new file mode 100644
index 0000000..894745f
--- /dev/null
+++ b/img/highlight_stacked_bg_left.svg
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1 48">
+	<g fill="#000000">
+		<rect y="2" width="1" height="1" opacity="0.5"/>
+		<rect y="0" width="1"  height="2" opacity="0.2"/>
+	</g>
+</svg>
diff --git a/img/highlight_stacked_bg_right.svg b/img/highlight_stacked_bg_right.svg
new file mode 100644
index 0000000..47aa802
--- /dev/null
+++ b/img/highlight_stacked_bg_right.svg
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1 48">
+	<g fill="#000000">
+		<rect y="45" width="1" height="1" opacity="0.5"/>
+		<rect y="46" width="1"  height="2" opacity="0.2"/>
+	</g>
+</svg>