fix barely visible error bars and values

Author: Christian Lehner

samples/horizontal-tree.html

@@ -66,8 +66,8 @@
         11
       ],
       errorBars: {
-        'A': {plus: 25, minus: -2},
-        'C1.2': {plus: 14, minus: -4}
+        'A': {plus: 1, minus: 0.5},
+        'C1.2': {plus: 1.5, minus: -3}
       },
     }]
   };
@@ -106,6 +106,11 @@
                 offsetGridLines: true
               }
           }]
+        },
+        plugins: {
+          chartJsPluginErrorBars: {
+            color: '#999'
+          }
         }
       }
     });