edit

front/static/document.js

@@ -193,7 +193,7 @@ var Document =
             
             self.left = left * -1 + 10;
             self.zoom = 0;
-            if (self.left) {
+            if (self.left > 20) {
                 $(self.option.reader).css('margin-left', self.left);
                 self.zoom = 18;
             }