How is asp.net Authorization Rule preventing CSS to be applied

Question

I am preventing anonymous access to my web application using <deny users="?"/>. Since I want login page to be accessible to anonymous user I used the following rule

 <location path="Login.aspx">
 <system.web>
  <authorization>
    <allow users="?"/>
  </authorization>
 </system.web>
</location>

Since this rule prevented the css to be applied to the login page I used additional rule

<location path="Style.css">
<system.web>
  <authorization>
    <allow users="?"/>
  </authorization>
</system.web>

That fixed it and now css is applied to the login page. But before applying the above additional rule I checked the source of page in browser and found that there existed an entry for <link href="Style.css" rel="stylesheet" type="text/css" /> and clicking the link, the browser did take me to my css file and displayed all the styles. So I was wondering if the page has access to the `Style.css' what exactly is preventing the browser to apply the styles to different elements.

Answer 1

I removed the additional tested rule again.

<location path="Style.css">
 <system.web>
  <authorization>
    <allow users="?"/>
 </authorization>
</system.web>

I checked the status of the CSS file in browser as specified by @explunit in comments. The status this time is 302 found and clicking the CSS link does not display the CSS file. I think the CSS was cached by the browser thats why it displayed it for the first time.