diff --git a/css/app.css b/css/app.css
index 17b3f90ed..716c46fba 100644
--- a/css/app.css
+++ b/css/app.css
@@ -11,7 +11,7 @@ html, body {
 }
 
 body {
-    font: normal 12px/1.6667 -apple-system, BlinkMacSystemFont,
+    font: normal 12px/1.6667 "-apple-system", BlinkMacSystemFont,
         "Segoe UI", "Roboto", "Oxygen", "Ubuntu", "Cantarell",
         "Fira Sans", "Droid Sans", "Helvetica Neue", "Arial",
         sans-serif;