diff --git a/pygal/css/graph.css b/pygal/css/graph.css
index b8041df..98f853d 100644
--- a/pygal/css/graph.css
+++ b/pygal/css/graph.css
@@ -107,7 +107,8 @@
 
 {{ id }}.dot {
   stroke-width: 1px;
-  fill-opacity: 1;
+  fill-opacity: {{ style.dot_opacity }};
+  stroke-opacity: {{ style.dot_opacity }};
 }
 
 {{ id }}.dot.active {
diff --git a/pygal/style.py b/pygal/style.py
index f7aa5af..7440f62 100644
--- a/pygal/style.py
+++ b/pygal/style.py
@@ -73,6 +73,8 @@ class Style(object):
     stroke_opacity_hover = '.9'
     stroke_width_hover = '4'
 
+    dot_opacity = '1'
+
     transition = '150ms'
     colors = (
         '#F44336',  # 0