diff --git a/themes/style/y/main.css b/themes/style/y/main.css
index 9a39fe3..3bfe50b 100644
--- a/themes/style/y/main.css
+++ b/themes/style/y/main.css
@@ -900,6 +900,13 @@
 @media only screen and (max-width: 640px) {
   .deck-container {
     font-size: 1.5em; } }
+#MathJax_Message {
+  font-size: 0.4em !important;
+  font-shadow: none !important;
+  background: none !important;
+  border: none !important;
+  color: #586e75 !important; }
+
 .deck-container {
   color: #839496;
   background-color: #002b36;
diff --git a/themes/style/y/main.sass b/themes/style/y/main.sass
index d892d34..8d4eb17 100644
--- a/themes/style/y/main.sass
+++ b/themes/style/y/main.sass
@@ -1128,6 +1128,12 @@ $secondTextColor: $base1
   .deck-container
     font-size: 1.5em
 
+#MathJax_Message
+  font-size: .4em !important
+  font-shadow: none !important
+  background: none !important
+  border: none !important
+  color: $base01 !important
 
 .deck-container
   color: $base0