fix: Add message-box‘ s overlay style

fix: Add message-box‘ s overlay style

Author: ykshang

src/main.ts

@@ -18,6 +18,7 @@ import 'uno.css'
 // If you want to use ElMessage, import it.
 import 'element-plus/theme-chalk/src/message.scss'
 import 'element-plus/theme-chalk/src/message-box.scss'
+import 'element-plus/theme-chalk/src/overlay.scss' // the modal class for message box
 
 // if you do not need ssg:
 // import { createApp } from "vue";