优惠券 背景灰色兼容

@@ -78,6 +78,7 @@
     }
     }
 
 
     .not-avaliable {
     .not-avaliable {
-        -webkit-filter: grayscale(100%);
+        // -webkit-filter: grayscale(100%);
+        @include filter(grayscale(100%));
     }
     }
 }
 }