diff --git a/css/theme/beige.css b/css/theme/beige.css
index 56782f2d..4f5be268 100644
--- a/css/theme/beige.css
+++ b/css/theme/beige.css
@@ -213,6 +213,10 @@ body {
   border: 4px solid #333;
   box-shadow: 0 0 10px rgba(0, 0, 0, 0.15); }
 
+.reveal section img.plain {
+  border: 0;
+  box-shadow: none; }
+
 .reveal a img {
   -webkit-transition: all 0.15s linear;
   -moz-transition: all 0.15s linear;
diff --git a/css/theme/black.css b/css/theme/black.css
index fce771bf..3cee63e6 100644
--- a/css/theme/black.css
+++ b/css/theme/black.css
@@ -209,6 +209,10 @@ body {
   border: 4px solid #fff;
   box-shadow: 0 0 10px rgba(0, 0, 0, 0.15); }
 
+.reveal section img.plain {
+  border: 0;
+  box-shadow: none; }
+
 .reveal a img {
   -webkit-transition: all 0.15s linear;
   -moz-transition: all 0.15s linear;
diff --git a/css/theme/blood.css b/css/theme/blood.css
index e3959361..8dfdc1d3 100644
--- a/css/theme/blood.css
+++ b/css/theme/blood.css
@@ -212,6 +212,10 @@ body {
   border: 4px solid #eee;
   box-shadow: 0 0 10px rgba(0, 0, 0, 0.15); }
 
+.reveal section img.plain {
+  border: 0;
+  box-shadow: none; }
+
 .reveal a img {
   -webkit-transition: all 0.15s linear;
   -moz-transition: all 0.15s linear;
diff --git a/css/theme/league.css b/css/theme/league.css
index 5daa1d30..f5652af7 100644
--- a/css/theme/league.css
+++ b/css/theme/league.css
@@ -215,6 +215,10 @@ body {
   border: 4px solid #eee;
   box-shadow: 0 0 10px rgba(0, 0, 0, 0.15); }
 
+.reveal section img.plain {
+  border: 0;
+  box-shadow: none; }
+
 .reveal a img {
   -webkit-transition: all 0.15s linear;
   -moz-transition: all 0.15s linear;
diff --git a/css/theme/moon.css b/css/theme/moon.css
index 7250cc44..224c40a7 100644
--- a/css/theme/moon.css
+++ b/css/theme/moon.css
@@ -213,6 +213,10 @@ body {
   border: 4px solid #93a1a1;
   box-shadow: 0 0 10px rgba(0, 0, 0, 0.15); }
 
+.reveal section img.plain {
+  border: 0;
+  box-shadow: none; }
+
 .reveal a img {
   -webkit-transition: all 0.15s linear;
   -moz-transition: all 0.15s linear;
diff --git a/css/theme/night.css b/css/theme/night.css
index 1bc8fbb2..109d4c3c 100644
--- a/css/theme/night.css
+++ b/css/theme/night.css
@@ -207,6 +207,10 @@ body {
   border: 4px solid #eee;
   box-shadow: 0 0 10px rgba(0, 0, 0, 0.15); }
 
+.reveal section img.plain {
+  border: 0;
+  box-shadow: none; }
+
 .reveal a img {
   -webkit-transition: all 0.15s linear;
   -moz-transition: all 0.15s linear;
diff --git a/css/theme/serif.css b/css/theme/serif.css
index 200a9853..4e8674c2 100644
--- a/css/theme/serif.css
+++ b/css/theme/serif.css
@@ -209,6 +209,10 @@ body {
   border: 4px solid #000;
   box-shadow: 0 0 10px rgba(0, 0, 0, 0.15); }
 
+.reveal section img.plain {
+  border: 0;
+  box-shadow: none; }
+
 .reveal a img {
   -webkit-transition: all 0.15s linear;
   -moz-transition: all 0.15s linear;
diff --git a/css/theme/simple.css b/css/theme/simple.css
index a6fccd50..8122250f 100644
--- a/css/theme/simple.css
+++ b/css/theme/simple.css
@@ -209,6 +209,10 @@ body {
   border: 4px solid #000;
   box-shadow: 0 0 10px rgba(0, 0, 0, 0.15); }
 
+.reveal section img.plain {
+  border: 0;
+  box-shadow: none; }
+
 .reveal a img {
   -webkit-transition: all 0.15s linear;
   -moz-transition: all 0.15s linear;
diff --git a/css/theme/sky.css b/css/theme/sky.css
index f4220792..93b4e855 100644
--- a/css/theme/sky.css
+++ b/css/theme/sky.css
@@ -216,6 +216,10 @@ body {
   border: 4px solid #333;
   box-shadow: 0 0 10px rgba(0, 0, 0, 0.15); }
 
+.reveal section img.plain {
+  border: 0;
+  box-shadow: none; }
+
 .reveal a img {
   -webkit-transition: all 0.15s linear;
   -moz-transition: all 0.15s linear;
diff --git a/css/theme/solarized.css b/css/theme/solarized.css
index c112696e..317027e6 100644
--- a/css/theme/solarized.css
+++ b/css/theme/solarized.css
@@ -213,6 +213,10 @@ body {
   border: 4px solid #657b83;
   box-shadow: 0 0 10px rgba(0, 0, 0, 0.15); }
 
+.reveal section img.plain {
+  border: 0;
+  box-shadow: none; }
+
 .reveal a img {
   -webkit-transition: all 0.15s linear;
   -moz-transition: all 0.15s linear;
diff --git a/css/theme/template/theme.scss b/css/theme/template/theme.scss
index e0e5fb6f..91eeca71 100644
--- a/css/theme/template/theme.scss
+++ b/css/theme/template/theme.scss
@@ -267,6 +267,11 @@ body {
 	box-shadow: 0 0 10px rgba(0, 0, 0, 0.15);
 }
 
+	.reveal section img.plain {
+		border: 0;
+		box-shadow: none;
+	}
+
 	.reveal a img {
 		-webkit-transition: all .15s linear;
 		   -moz-transition: all .15s linear;
diff --git a/css/theme/white.css b/css/theme/white.css
index 48754bd5..f37aa9dc 100644
--- a/css/theme/white.css
+++ b/css/theme/white.css
@@ -209,6 +209,10 @@ body {
   border: 4px solid #222;
   box-shadow: 0 0 10px rgba(0, 0, 0, 0.15); }
 
+.reveal section img.plain {
+  border: 0;
+  box-shadow: none; }
+
 .reveal a img {
   -webkit-transition: all 0.15s linear;
   -moz-transition: all 0.15s linear;