diff --git a/iOS/Resources/styleSheet.css b/iOS/Resources/styleSheet.css
index 6405a9347..df1c80612 100644
--- a/iOS/Resources/styleSheet.css
+++ b/iOS/Resources/styleSheet.css
@@ -141,6 +141,18 @@ figcaption {
 	line-height: 1.3em;
 }
 
+sup {
+	vertical-align: top;
+	position: relative;
+	bottom: 0.2rem;
+}
+
+sub {
+	vertical-align: bottom;
+	position: relative;
+	top: 0.2rem;
+}
+
 .iframeWrap {
 	position: relative;
 	display: block;