diff --git a/css/theme/beige.css b/css/theme/beige.css
index 56782f2df266ef313c309b986eb888c92925e4ff..4f5be268f7e4be4f0a6a71797efdcf64f8a68436 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 fce771bf2573128f5d0077408ad2da4601477bb1..3cee63e6365cc7d224ffe058f4955dd0712d44d9 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 e3959361cf65f9a11478d55b54fc1f9d79ca6bdc..8dfdc1d34dcc44afbd668d5a29c4b9e00b9bce56 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 5daa1d3029a30d617e39fcc3586bf835ec8dce6b..f5652af7bb8cb95aeaf08ddd5d5298b61ff335e9 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 7250cc44466461210470ba986fd55713e55d7b10..224c40a7d875ea8c8041f33c82f608fc7a260a77 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 1bc8fbb2d53602327ce4f43b3abcb1ea78531218..109d4c3c27f414ee3f5211a34ead2b866828f501 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 200a985347fb8dca0c424fdf29c7ed8e927246b4..4e8674c29d805dc5fb58897963e1b7b530e50387 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 a6fccd50b216a19c1c5e62e5294373c95b216b58..8122250ffbcdc034740edb7c75f70ea1139005be 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 f4220792d0390b5fdcc6d8dc566262f15f6eaa07..93b4e8556f627618a29bdbc2f827c4e235afb431 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 c112696eb24fe3e236ddfae957c7d6e288190f34..317027e603abb9ffd5b20ef9e06a5f6fbd58489c 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 e0e5fb6fa2a7904240210f5ab83314d6f0000436..91eeca7141e44f2e123d4b303caca99ed2093150 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 48754bd5049ea4c95d90d947f9e720310e3db429..f37aa9dc14cb54151155b27eeeed6c856cbe44d9 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;