diff --git a/index.html b/index.html
index 7d59e24..6339d45 100644
--- a/index.html
+++ b/index.html
@@ -13,7 +13,7 @@ html {
 
 body {
     background-image: url('magenta-tile-4.png');
-    background-size: 1.23em;
+    background-size: 1rem;
     color: darkgray;
     text-shadow: 2px 2px black;
     font-family: sans-serif;