Codeigniter CSS htaccess，不能读取文件

在我的codeigniter应用程序的根目录中有一个名为/css的目录，它包含文件style.css。当我使用href="<?php echo base_url();?>css/styles.css"链接到文件时，我的css不运行，显示为html。

我在网上读到，我需要修改我的。htaccess文件，以便做到这一点，许多文章已经解释了如何，但方法只是没有为我工作。

如何使用下面的htaccess代码读取以下文件夹/images，/js，/css。

我使用codeigniter默认的htaccess代码来删除index.php

<IfModule mod_rewrite.c>
    RewriteEngine On
    RewriteBase /
    #Removes access to the system folder by users.
    #Additionally this will allow you to create a System.php controller,
    #previously this would not have been possible.
    #'system' can be replaced if you have renamed your system folder.
    RewriteCond %{REQUEST_URI} ^system.*
    RewriteRule ^(.*)$ /index.php?/$1 [L]
    #When your application folder isn't in the system folder
    #This snippet prevents user access to the application folder
    #Submitted by: Fabdrol
    #Rename 'application' to your applications folder name.
    RewriteCond %{REQUEST_URI} ^application.*
    RewriteRule ^(.*)$ /index.php?/$1 [L]
    #Checks to see if the user is attempting to access a valid file,
    #such as an image or css document, if this isn't true it sends the
    #request to index.php
    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteRule ^(.*)$ index.php?/$1 [L]
</IfModule>
<IfModule !mod_rewrite.c>
    # If we don't have mod_rewrite installed, all 404's
    # can be sent to index.php, and everything works as normal.
    # Submitted by: ElliotHaughin
    ErrorDocument 404 /index.php
</IfModule>