diff --git a/css/style.css b/css/style.css
index b5d312d1..cdf8eb1a 100644
--- a/css/style.css
+++ b/css/style.css
@@ -231,6 +231,7 @@ textarea.contenteditable {-webkit-appearance: none;}
 @media
 only screen and (-webkit-min-device-pixel-ratio: 1.5),
 only screen and (-o-min-device-pixel-ratio: 3/2),
+only screen and (min--moz-device-pixel-ratio: 1.5),
 only screen and (min-device-pixel-ratio: 1.5) {
   /* Styles */
 }