diff --git a/index.html b/index.html
index 2d82518..0f9a3f9 100644
--- a/index.html
+++ b/index.html
@@ -63,6 +63,10 @@
         opacity: 0;
       }
 
+      input[type="range"].off {
+        opacity: 0.5;
+      }
+
       body.readOnly .hideIfReadOnly {
         display: none;
       }