diff --git a/src/theme.ts b/src/theme.ts
index 52a60e9c1..d57ce19d0 100644
--- a/src/theme.ts
+++ b/src/theme.ts
@@ -342,6 +342,9 @@ export default (colors: IThemeColors): Theme =>
             }
           }
         },
+        message: {
+          fontSize: 16
+        },
         root: {
           backgroundColor: colors.background.paper,
           boxShadow: