diff --git a/css/theme/beige.css b/css/theme/beige.css
index b0610d40..3b05467c 100644
--- a/css/theme/beige.css
+++ b/css/theme/beige.css
@@ -1,7 +1,7 @@
-@import url(http://fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic);
+@import url(//fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic);
 /**
  * Beige theme for reveal.js.
- * 
+ *
  * Copyright (C) 2011-2012 Hakim El Hattab, http://hakim.se
  */
 @font-face {
diff --git a/css/theme/default.css b/css/theme/default.css
index 480ac69e..087b9f27 100644
--- a/css/theme/default.css
+++ b/css/theme/default.css
@@ -1,7 +1,7 @@
-@import url(http://fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic);
+@import url(//fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic);
 /**
  * Default theme for reveal.js.
- * 
+ *
  * Copyright (C) 2011-2012 Hakim El Hattab, http://hakim.se
  */
 @font-face {
diff --git a/css/theme/moon.css b/css/theme/moon.css
index 24c1d7b7..d0836c0b 100644
--- a/css/theme/moon.css
+++ b/css/theme/moon.css
@@ -1,4 +1,4 @@
-@import url(http://fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic);
+@import url(//fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic);
 /**
  * Solarized Dark theme for reveal.js.
  * Author: Achim Staebler
diff --git a/css/theme/night.css b/css/theme/night.css
index e2e95080..f4a8aea6 100644
--- a/css/theme/night.css
+++ b/css/theme/night.css
@@ -1,8 +1,8 @@
-@import url(http://fonts.googleapis.com/css?family=Montserrat:700);
-@import url(http://fonts.googleapis.com/css?family=Open+Sans:400,700,400italic,700italic);
+@import url(//fonts.googleapis.com/css?family=Montserrat:700);
+@import url(//fonts.googleapis.com/css?family=Open+Sans:400,700,400italic,700italic);
 /**
  * Black theme for reveal.js.
- * 
+ *
  * Copyright (C) 2011-2012 Hakim El Hattab, http://hakim.se
  */
 /*********************************************
diff --git a/css/theme/simple.css b/css/theme/simple.css
index 0aef9160..00ab5c42 100644
--- a/css/theme/simple.css
+++ b/css/theme/simple.css
@@ -1,9 +1,9 @@
-@import url(http://fonts.googleapis.com/css?family=News+Cycle:400,700);
-@import url(http://fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic);
+@import url(//fonts.googleapis.com/css?family=News+Cycle:400,700);
+@import url(//fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic);
 /**
- * A simple theme for reveal.js presentations, similar 
+ * A simple theme for reveal.js presentations, similar
  * to the default theme. The accent color is darkblue.
- * 
+ *
  * This theme is Copyright (C) 2012 Owen Versteeg, https://github.com/StereotypicalApps. It is MIT licensed.
  * reveal.js is Copyright (C) 2011-2012 Hakim El Hattab, http://hakim.se
  */
diff --git a/css/theme/sky.css b/css/theme/sky.css
index c5cbbeb4..32cc4c17 100644
--- a/css/theme/sky.css
+++ b/css/theme/sky.css
@@ -1,8 +1,8 @@
-@import url(http://fonts.googleapis.com/css?family=Quicksand:400,700,400italic,700italic);
-@import url(http://fonts.googleapis.com/css?family=Open+Sans:400italic,700italic,400,700);
+@import url(//fonts.googleapis.com/css?family=Quicksand:400,700,400italic,700italic);
+@import url(//fonts.googleapis.com/css?family=Open+Sans:400italic,700italic,400,700);
 /**
  * Sky theme for reveal.js.
- * 
+ *
  * Copyright (C) 2011-2012 Hakim El Hattab, http://hakim.se
  */
 /*********************************************
diff --git a/css/theme/solarized.css b/css/theme/solarized.css
index a89fd096..0534eb37 100644
--- a/css/theme/solarized.css
+++ b/css/theme/solarized.css
@@ -1,4 +1,4 @@
-@import url(http://fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic);
+@import url(//fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic);
 /**
  * Solarized Light theme for reveal.js.
  * Author: Achim Staebler
diff --git a/css/theme/source/beige.scss b/css/theme/source/beige.scss
index af8c6154..34ff05fd 100644
--- a/css/theme/source/beige.scss
+++ b/css/theme/source/beige.scss
@@ -25,7 +25,7 @@
 	font-style: normal;
 }
 
-@import url(http://fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic);
+@import url(//fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic);
 
 
 // Override theme settings (see ../template/settings.scss)
diff --git a/css/theme/source/default.scss b/css/theme/source/default.scss
index 4e1e5ab1..01e18ce4 100644
--- a/css/theme/source/default.scss
+++ b/css/theme/source/default.scss
@@ -25,7 +25,7 @@
 	font-style: normal;
 }
 
-@import url(http://fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic);
+@import url(//fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic);
 
 // Override theme settings (see ../template/settings.scss)
 $heading1TextShadow: 0 1px 0 #ccc, 0 2px 0 #c9c9c9, 0 3px 0 #bbb, 0 4px 0 #b9b9b9, 0 5px 0 #aaa, 0 6px 1px rgba(0,0,0,.1), 0 0 5px rgba(0,0,0,.1), 0 1px 3px rgba(0,0,0,.3), 0 3px 5px rgba(0,0,0,.2), 0 5px 10px rgba(0,0,0,.25), 0 20px 20px rgba(0,0,0,.15);
diff --git a/css/theme/source/moon.scss b/css/theme/source/moon.scss
index b1209358..a885787a 100644
--- a/css/theme/source/moon.scss
+++ b/css/theme/source/moon.scss
@@ -24,7 +24,7 @@
 	font-style: normal;
 }
 
-@import url(http://fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic);
+@import url(//fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic);
 
 /**
  * Solarized colors by Ethan Schoonover
diff --git a/css/theme/source/night.scss b/css/theme/source/night.scss
index 4dd514fd..0d3219b2 100644
--- a/css/theme/source/night.scss
+++ b/css/theme/source/night.scss
@@ -12,8 +12,8 @@
 
 
 // Include theme-specific fonts
-@import url(http://fonts.googleapis.com/css?family=Montserrat:700);
-@import url(http://fonts.googleapis.com/css?family=Open+Sans:400,700,400italic,700italic);
+@import url(//fonts.googleapis.com/css?family=Montserrat:700);
+@import url(//fonts.googleapis.com/css?family=Open+Sans:400,700,400italic,700italic);
 
 
 // Override theme settings (see ../template/settings.scss)
diff --git a/css/theme/source/simple.scss b/css/theme/source/simple.scss
index 5d6aa41b..47e5498b 100644
--- a/css/theme/source/simple.scss
+++ b/css/theme/source/simple.scss
@@ -15,8 +15,8 @@
 
 
 // Include theme-specific fonts
-@import url(http://fonts.googleapis.com/css?family=News+Cycle:400,700);
-@import url(http://fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic);
+@import url(//fonts.googleapis.com/css?family=News+Cycle:400,700);
+@import url(//fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic);
 
 
 // Override theme settings (see ../template/settings.scss)
diff --git a/css/theme/source/sky.scss b/css/theme/source/sky.scss
index f83ed91d..8f59121e 100644
--- a/css/theme/source/sky.scss
+++ b/css/theme/source/sky.scss
@@ -13,8 +13,8 @@
 
 
 // Include theme-specific fonts
-@import url(http://fonts.googleapis.com/css?family=Quicksand:400,700,400italic,700italic);
-@import url(http://fonts.googleapis.com/css?family=Open+Sans:400italic,700italic,400,700);
+@import url(//fonts.googleapis.com/css?family=Quicksand:400,700,400italic,700italic);
+@import url(//fonts.googleapis.com/css?family=Open+Sans:400italic,700italic,400,700);
 
 
 // Override theme settings (see ../template/settings.scss)
diff --git a/css/theme/source/solarized.scss b/css/theme/source/solarized.scss
index 5e283efe..4614de29 100644
--- a/css/theme/source/solarized.scss
+++ b/css/theme/source/solarized.scss
@@ -24,7 +24,7 @@
 	font-style: normal;
 }
 
-@import url(http://fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic);
+@import url(//fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic);
 
 
 /**