A great forum post at Sitepoint and the solutions posted by the experts.
This is a comprehensive tutorial by Máté Huszárik that teaches how to build interactive bar chards with D3.js.
Do you experience this same proplem? Read what the masters recommend in this informative forum post at Sitepoint.
If you find issues in configuring webpack to output multiple css files from sass, then you need to read the answers from the masters to this Sitepoint forum post.