晒选框小箭头 没底线

@@ -284,12 +284,12 @@
     }
 
     .senior-up-icon {
+        position: relative;
         width: 100%;
         height: 9px;
-        z-index: 1;
+        z-index: 3;
         margin-left: -11px;
         visibility: hidden;
-
         background: image-url('product/senior-up.png') no-repeat;
         background-position-x: 50%;
     }