添加icon

app/src/components/myGame/style.scss

@@ -64,6 +64,9 @@
                     .choice-serve {
                         color: $main-active-color;
                     }
+                    .icon-serve {
+                        background-image: url(./img/icon_serve_hover.png) ;
+                    }
                 }
                 
             }