diff --git a/tufte.css b/tufte.css
index c9b2528..c6d8135 100644
--- a/tufte.css
+++ b/tufte.css
@@ -41,7 +41,7 @@
 
 /* Tufte CSS styles */
 html {
-    font-size: 15px;
+    font-size: 93.75%;
 }
 
 body {