vue3+vite elementplus安装官网教程修改主题色为什么不起作用呢？

Question

export default defineConfig({
    resolve: {
        alias: {
            "@": resolve(__dirname, './src')
        }
    },
    css: {
        preprocessorOptions: {
            scss: {
                additionalData: `@use "./src/assets/styles/element/index.scss" as *;`,
            },
        },
    },
    plugins: [
        vue(),
        AutoImport({
            resolvers: [ElementPlusResolver()],
        }),
        Components({
            resolvers: [
                ElementPlusResolver({
                    importStyle: "sass",
                }),
            ],
        }),
    ],
    // 配置前端服务地址和端口
    server: {
        port: 8991,
        // 是否开启 https
        https: false,
    },

})

按照官网的步骤修改的样式，但是不生效 还是之前的默认主题颜色