CSS not loading on Chrome for drupal site after moving to https
The warning which you see is because some of the contents are not secure, which means they are fetched using http instead of https.
As per the limited information provided by you, I'd suggest you to follow the following steps:


Inspect the source code of the page, by pressing CTRL + U, in Chrome.  
Check to see if there are links present in the content(specially the &lt;head&gt; section) are using the pattern http://... instead of https.  
Find the resources (css/js/images) which are loaded using http.  
Identify which part of the site (module or a theme function) adds that resource. 
Make the necessary changes to make sure the resources are loaded securely i.e. via https.