Update photo-detail.module.less

src/school/orchestra/compontent/photo-detail.module.less

@@ -123,7 +123,7 @@
   width: 20px;
   height: 20px;
   border-radius: 50%;
-  background: rgba(255, 255, 255, 0.2);
+  background: rgba(0, 0, 0, 0.3);
   padding: 8px;
   box-shadow: 0 2px 8px 0px rgba(0, 0, 0, .2);