In my case, same error was coming with JSP. This is how I got to the root of this issue: I went to the Network tab and clearly saw that the browser request to fetch the css was returning response header having "Content-type" : "text/html". I opened another tab and manually hit the request to fetch the css. It ended up returning a html log in form. Turns out that my web application had a url mapping for path = / Tomcat servlet entry : (@WebServlet({ "/, /index", }). So, any unmatching request URLs were somehow being matched to / and the corresponding servlet was returning a Log in html form. I fixed it by removing the mapping to /

此外，tomcat配置wrt处理css MIME-TYPE已经存在。

In my case, same error was coming with JSP. This is how I got to the root of this issue: I went to the Network tab and clearly saw that the browser request to fetch the css was returning response header having "Content-type" : "text/html". I opened another tab and manually hit the request to fetch the css. It ended up returning a html log in form. Turns out that my web application had a url mapping for path = / Tomcat servlet entry : (@WebServlet({ "/, /index", }). So, any unmatching request URLs were somehow being matched to / and the corresponding servlet was returning a Log in html form. I fixed it by removing the mapping to /

此外，tomcat配置wrt处理css MIME-TYPE已经存在。

以防有人来到这个帖子，有类似的问题。我也遇到过类似的问题，但是解决方法很简单。

一名开发人员错误地丢失了一份网页副本。将config文件放到CSS目录下。删除后，所有错误都得到解决，页面正常显示。

I faced the same issue while configuring Postfix Admin 3.2. According to the official documentation, the whole Postfix Admin content should be extracted into a separate directory, i.e. /srv/postfixadmin and not the document root. Only the /srv/postfixadmin/public directory should be symlinked into /var/www/html document root. I have just extracted the whole content into /var/www/html. Having played with Nginx server block settings, I managed example.com/postfixadmin resolving from /var/www/html/postfixadmin/public. Nevertheless, images and CSS were not available with 404 status code. The stylesheets were broken. I got the error message OP quoted with respective 404 entries in access log.

在我的情况下，我只是移动/var/www/html/postfixadmin到/srv/postfixadmin和ln -s /srv/postfixadmin/公共/var/www/html/postfixadmin。这完全解决了问题。 这是参考资料。

我在恢复一个旧的MEAN堆栈项目时遇到了同样的问题。我使用nodemon作为我的本地开发服务器，得到了相同的错误资源解释为样式表，但使用MIME类型text/html传输。我从nodemon更改为http-server，可以在这里找到。它立刻对我起了作用。

有同样的错误，因为我忘记发送一个正确的头

header("Content-type: text/css; charset: UTF-8");
print 'body { text-align: justify; font-size: 2em; }';