I am working on a themable website, meaning the administrator can pick primary/secondary colors to customize the UI.The website is build in .net and the style rules are written in less.js. The current implementation uses a homemade webpack plugin that bundles the less files together. Some less files contains undefined variables. Those variable are provided at runtime through dotless (ie the stylesheet url looks like this: www.mysite.com/main.bundle.less?primary=green)We have two problems with this solution:the custom plugin must be maintained (webpack 1 -> webpack 2 migration)we would like to move away from dotless since it is not compatible with less.jsI could not find many articles on this topic. We have two ideas:build the css in the browserwhen the administrator saves a new theme, create the css on the server and serve that to the userBoth options requires to bundle the required less file into one less file bundle. I could not find any existing webpack plugin that does this.Are there other options? What are the usual ways to provide this feature? 
create a themable website with less.js
.net;less;dotless