diff --git a/css/theme/beige.css b/css/theme/beige.css
index e1e635a87790560cf0ab5afc589f742c1c861072..6d2eea99b22348ba83cc5812f4b682ec4b49a1e5 100644
--- a/css/theme/beige.css
+++ b/css/theme/beige.css
@@ -110,13 +110,36 @@ body {
 /*********************************************
  * NAVIGATION CONTROLS
  *********************************************/
-.reveal .controls a {
-  color: #333333;
+.reveal .controls div.left {
+  border-right-color: #333333;
 }
 
-.reveal .controls a.enabled {
-  color: #c0a86e;
-  text-shadow: 0px 0px 2px rgba(144, 207, 213, 0.3);
+.reveal .controls div.right {
+  border-left-color: #333333;
+}
+
+.reveal .controls div.up {
+  border-bottom-color: #333333;
+}
+
+.reveal .controls div.down {
+  border-top-color: #333333;
+}
+
+.reveal .controls div.left.enabled {
+  border-right-color: #c0a86e;
+}
+
+.reveal .controls div.right.enabled {
+  border-left-color: #c0a86e;
+}
+
+.reveal .controls div.up.enabled {
+  border-bottom-color: #c0a86e;
+}
+
+.reveal .controls div.down.enabled {
+  border-top-color: #c0a86e;
 }
 
 /*********************************************
diff --git a/css/theme/default.css b/css/theme/default.css
index 3fe7a2a07e9fb48ce3deeec192182cfb3696b5d1..0b393c21353d3ce3db905a68209f35e5aae5f5d1 100644
--- a/css/theme/default.css
+++ b/css/theme/default.css
@@ -110,13 +110,36 @@ body {
 /*********************************************
  * NAVIGATION CONTROLS
  *********************************************/
-.reveal .controls a {
-  color: #eeeeee;
+.reveal .controls div.left {
+  border-right-color: #eeeeee;
 }
 
-.reveal .controls a.enabled {
-  color: #71e9f4;
-  text-shadow: 0px 0px 2px rgba(144, 207, 213, 0.3);
+.reveal .controls div.right {
+  border-left-color: #eeeeee;
+}
+
+.reveal .controls div.up {
+  border-bottom-color: #eeeeee;
+}
+
+.reveal .controls div.down {
+  border-top-color: #eeeeee;
+}
+
+.reveal .controls div.left.enabled {
+  border-right-color: #71e9f4;
+}
+
+.reveal .controls div.right.enabled {
+  border-left-color: #71e9f4;
+}
+
+.reveal .controls div.up.enabled {
+  border-bottom-color: #71e9f4;
+}
+
+.reveal .controls div.down.enabled {
+  border-top-color: #71e9f4;
 }
 
 /*********************************************
diff --git a/css/theme/serif.css b/css/theme/serif.css
index 78ed93137b6bb2c001cf49cb0f3a569064001d8a..55a6b3a4b1e9b00764241b5829ffe72957df9000 100644
--- a/css/theme/serif.css
+++ b/css/theme/serif.css
@@ -97,13 +97,36 @@ body {
 /*********************************************
  * NAVIGATION CONTROLS
  *********************************************/
-.reveal .controls a {
-  color: black;
+.reveal .controls div.left {
+  border-right-color: black;
 }
 
-.reveal .controls a.enabled {
-  color: #8b7c69;
-  text-shadow: 0px 0px 2px rgba(144, 207, 213, 0.3);
+.reveal .controls div.right {
+  border-left-color: black;
+}
+
+.reveal .controls div.up {
+  border-bottom-color: black;
+}
+
+.reveal .controls div.down {
+  border-top-color: black;
+}
+
+.reveal .controls div.left.enabled {
+  border-right-color: #8b7c69;
+}
+
+.reveal .controls div.right.enabled {
+  border-left-color: #8b7c69;
+}
+
+.reveal .controls div.up.enabled {
+  border-bottom-color: #8b7c69;
+}
+
+.reveal .controls div.down.enabled {
+  border-top-color: #8b7c69;
 }
 
 /*********************************************
diff --git a/css/theme/simple.css b/css/theme/simple.css
index 663c09a75e71291fc4c90e82c3d179f7dd4fc09f..8fb23c400d77865ed56cedcda76184f461f4bf6e 100644
--- a/css/theme/simple.css
+++ b/css/theme/simple.css
@@ -99,13 +99,36 @@ body {
 /*********************************************
  * NAVIGATION CONTROLS
  *********************************************/
-.reveal .controls a {
-  color: black;
+.reveal .controls div.left {
+  border-right-color: black;
 }
 
-.reveal .controls a.enabled {
-  color: #0000f1;
-  text-shadow: 0px 0px 2px rgba(144, 207, 213, 0.3);
+.reveal .controls div.right {
+  border-left-color: black;
+}
+
+.reveal .controls div.up {
+  border-bottom-color: black;
+}
+
+.reveal .controls div.down {
+  border-top-color: black;
+}
+
+.reveal .controls div.left.enabled {
+  border-right-color: #0000f1;
+}
+
+.reveal .controls div.right.enabled {
+  border-left-color: #0000f1;
+}
+
+.reveal .controls div.up.enabled {
+  border-bottom-color: #0000f1;
+}
+
+.reveal .controls div.down.enabled {
+  border-top-color: #0000f1;
 }
 
 /*********************************************
diff --git a/css/theme/sky.css b/css/theme/sky.css
index cd0be945c82264e2d5f72e951608c86c5bba0143..d68fc8b1e2c961352be195cc8b1ca0cb59c0dc78 100644
--- a/css/theme/sky.css
+++ b/css/theme/sky.css
@@ -103,13 +103,36 @@ body {
 /*********************************************
  * NAVIGATION CONTROLS
  *********************************************/
-.reveal .controls a {
-  color: #333333;
+.reveal .controls div.left {
+  border-right-color: #333333;
 }
 
-.reveal .controls a.enabled {
-  color: #74a7cb;
-  text-shadow: 0px 0px 2px rgba(144, 207, 213, 0.3);
+.reveal .controls div.right {
+  border-left-color: #333333;
+}
+
+.reveal .controls div.up {
+  border-bottom-color: #333333;
+}
+
+.reveal .controls div.down {
+  border-top-color: #333333;
+}
+
+.reveal .controls div.left.enabled {
+  border-right-color: #74a7cb;
+}
+
+.reveal .controls div.right.enabled {
+  border-left-color: #74a7cb;
+}
+
+.reveal .controls div.up.enabled {
+  border-bottom-color: #74a7cb;
+}
+
+.reveal .controls div.down.enabled {
+  border-top-color: #74a7cb;
 }
 
 /*********************************************
diff --git a/css/theme/template/theme.scss b/css/theme/template/theme.scss
index 353a98cfebe16d4e12ce0f375ee719725f73f1e2..9c22ecb747b93305d81b95fb4368cdddf6ad760f 100644
--- a/css/theme/template/theme.scss
+++ b/css/theme/template/theme.scss
@@ -106,13 +106,37 @@ body {
  * NAVIGATION CONTROLS
  *********************************************/
 
-.reveal .controls a {
-	color: $mainColor;
+.reveal .controls div.left {
+	border-right-color: $mainColor;
+}
+
+.reveal .controls div.right {
+	border-left-color: $mainColor;
+}
+
+.reveal .controls div.up {
+	border-bottom-color: $mainColor;
+}
+
+.reveal .controls div.down {
+	border-top-color: $mainColor;
+}
+
+.reveal .controls div.left.enabled {
+	border-right-color: $linkColorHover;
+}
+
+.reveal .controls div.right.enabled {
+	border-left-color: $linkColorHover;
+}
+
+.reveal .controls div.up.enabled {
+	border-bottom-color: $linkColorHover;
+}
+
+.reveal .controls div.down.enabled {
+	border-top-color: $linkColorHover;
 }
-	.reveal .controls a.enabled {
-		color: $linkColorHover;
-		text-shadow: 0px 0px 2px hsla(185, 45%, 70%, 0.3);
-	}
 
 
 /*********************************************