title: How can I "hack" the Thunderbird Lightning extension to fully color categories
body: <p><sub>(Note: While I'm not entirely sure if this be better asked on SuperUser, I guess the fact that you probably will have to mess around in the xpi/jar file with the css settings, should make it suitable for SO.)</sub></p>
  
  <p>Mozilla Thunderbird's Calendar extension, Lightning, will use different colors for different calendars, and just use a narrow vertical bar for the category color: (Light blue as calendar color and red as category color)</p>
  
  <p><img src="https://i.stack.imgur.com/XOzRi.png" alt="enter image description here"></p>
  
  <p>What I would like to find out is how I could go about changing/"hacking" the css styles that - surely - must be associated with this, buried somewhere in the plugin directory, so that in the example above, the event would be fully colored red.</p>
  
  <p>Anyone know how to achieve this?</p>