htaccess url rewrite css＆amp;图像没有加载

Question

RewriteEngine On # Turn on the rewriting engine

RewriteRule ^index/?$ index.php
RewriteRule ^activity/?$ activity.php
RewriteRule ^aboutus/?$ aboutus.php
RewriteRule ^events/?$ events.php
RewriteRule ^photogallery/?$ photogallery.php
RewriteRule ^contact/?$ contact.php
RewriteRule ^downloads/?$ downloads.php


RewriteRule ^activity/([0-9]+)/?$ activityDetail.php?id=$1

这是我的.htaccess文件代码

这里出现问题“RewriteRule ^activity/([0-9]+)/?$ activityDetail.php?id=$1”它是重写但在页面中没有加载css和;图片

所以请帮我解决我的代码有什么问题