Steps to Reproduce

1. Add an Issue Collector to Custom HTML in Confluence
2. Add this to the Stylesheet:

   // These colour the activity stream links, and visited links   
   .stream-item-heading {  
   color:#6b0000 !important;  
   }  
   .stream-item-heading:visited {  
   color:#8f5e5e !important;  
   }  
       
   .atlwdg-trigger {  
   background:white !important;    
   }  
   

   • Observe that the initial comment has no effect and the issue collector is styled with a white background as desired
3. Change the custom CSS to this (ie add a comment like a good admin should):

   // These colour the activity stream links, and visited links   
   .stream-item-heading {  
   color:#6b0000 !important;  
   }  
   .stream-item-heading:visited {  
   color:#8f5e5e !important;  
   }  
     
   // This styles the Got Feedback link  
   .atlwdg-trigger {  
   background:white !important;  
   }  
   

   • Observe that your custom CSS is no longer applied and the background is dark blue again