diff --git a/static/js/trendings.js b/static/js/trendings.js
index aa63571..d87aeae 100644
--- a/static/js/trendings.js
+++ b/static/js/trendings.js
@@ -43,6 +43,7 @@ var pieChartOption = {
             innerRadius: 0.2,
             show: true,
             radius: 100,
+            stroke: { color: 'black' },
             label: {
                 show: true,
                 radius: 6/10,