Move Y-ticks to left 

@@ -29,6 +29,8 @@
     dclrs              => ['#ff782a', '#6daa3a', '#4d7296'],
     y_max_value        => 60,
     y_tick_number      => 3,
+    tick_length        => -4,
+    axis_space         => 6,
 ) or die $graph->error;
 
 $graph->set_legend(@products);