added "gap"-variable to css

partials/GridEditor.vue

@@ -1288,6 +1288,7 @@
 
   //************************************************** mobile: new cell
   handler-width = 40px
+  gap = 4px
 
   .main-handler
     position absolute
@@ -1318,12 +1319,12 @@
         opacity 1
 
       &.left-side
-        left 4px
+        left gap
         right auto
       &.right-side
         // left 'calc(100vw - %s)' % handler-width
         left auto
-        right 4px
+        right gap
 
 </style>