title: Compiling custom Bootstrap css in yii2 from less
body: <p>I'm starting a new project in Yii2 and Composer (after a few projects with YII 1).</p>
  
  <p>I created a new "advanced project" with composer. Everything is okay but, I'm wondering what is the best way to customize the bootstrap theme? </p>
  
  <p>I think copying the whole bootstrap less to the backend and to the frontend and edit the two variables file and compile it isn't the right way. </p>
  
  <p>So: is it somehow possible to extend the less files downloaded by the composer and edit only the two variables file?</p>