fixing promo backgrounds in webkit

media/css/impala/promos.less

@@ -284,10 +284,10 @@
     .addons li > a,
     #monthly > div,
     #go-mobile > div {
-        background: -moz-linear-gradient(top, #fff 0, #ecf1f7 100%);
+        .gradient-two-color(#fff, #ecf1f7);
         border: 1px solid #b7c3d7;
-        border-radius: 6px;
-        box-shadow: inset 0 -2px 0 rgba(58,78,103,0.08), 0 2px 0 rgba(190,210,230,0.5);
+        .border-radius(6px);
+        .box-shadow(0 -2px 0 rgba(58,78,103,0.08) inset, 0 2px 0 rgba(190,210,230,0.5);
     }
 
     .addons li > a {