diff --git a/src/browser/css/jp_fonts.css b/src/browser/css/jp_fonts.css
index 22e36fe4..7b6b7f56 100644
--- a/src/browser/css/jp_fonts.css
+++ b/src/browser/css/jp_fonts.css
@@ -3,6 +3,11 @@
   src: local('Meiryo UI');
 }
 
+@font-face {
+  font-family: 'sans-serif';
+  src: local('Meiryo UI');
+}
+
 @font-face {
   font-family: monospace;
   src: local('MS Gothic');