title: How can I change the colour theme for Apache Superset
body: <p>I am deploying superset for my company and required to change the theme to blue. I have tried to follow the guide from <a href="https://debaatobiee.wordpress.com/2019/08/04/customizing-apache-superset-ui-config-theme-changes/" rel="nofollow noreferrer">https://debaatobiee.wordpress.com/2019/08/04/customizing-apache-superset-ui-config-theme-changes/</a> but still unsuccessful. </p>
  
  <p>I have few questions in mind:-<br>
  1. Do we need to rebuild superset after amended variable.less?<br>
  2. If rebuild is required, if I upgraded to latest version in future, do I required to rebuild it again?  </p>