diff --git a/src/pages/course/type-pie/type-pie.ts b/src/pages/course/type-pie/type-pie.ts
index 2fa0025..05c4133 100644
--- a/src/pages/course/type-pie/type-pie.ts
+++ b/src/pages/course/type-pie/type-pie.ts
@@ -46,6 +46,7 @@ export default class TypePie extends Vue
                     itemStyle:
                     {
                         color: Constants.THEME.colors[i],
+                        opacity: 0.8,
                         shadowColor: 'rgba(0,0,0,0.22)',
                         shadowBlur: 10
                     }