diff --git a/css/main.css b/css/main.css
index 3f546b602758d23896bf08c673bc501e64b1668b..d8c357749e15114f0c53ac08b8774362c6daa2c3 100644
--- a/css/main.css
+++ b/css/main.css
@@ -220,6 +220,13 @@ body {
  	 text-shadow: rgb(255,255,255) 1px 1px 2px;
 }
 
+.reveal sup { 
+	vertical-align: super;
+}
+.reveal sub { 
+	vertical-align: sub;
+}
+
 .reveal small {
 	font-size: 60%;
 	line-height: 1em;