Set line and text colours 

@@ -26,6 +26,11 @@
     transparent        => 0,
     bgclr              => 'white',
     box_axis           => 0,
+    fgclr              => '#bbbbbb',
+    axislabelclr       => '#333333',
+    labelclr           => '#333333',
+    textclr            => '#333333',
+    legendclr          => '#333333',
     dclrs              => ['#ff782a', '#6daa3a', '#4d7296'],
     y_max_value        => 60,
     y_tick_number      => 3,