devdocs/assets/stylesheets/pages/_webpack.scss

._webpack {
  > h2 { @extend %block-heading; }
  > h3 { @extend %block-label, %label-blue; }
  > h4 { font-size: 1em; }

  /*
    Copied from the original webpack css
    https://webpack.github.io/docs/css/doc.css
  */
  code .comment {
      color: #998;
      font-style: italic
  }

  code .keyword {
      color: #333;
      font-weight: 700
  }

  code .number {
      color: #099
  }

  code .string {
      color: #d14
  }

  code .tag {
      color: navy;
      font-weight: 400
  }

  code .attribute {
      color: teal
  }

  code .regexp {
      color: #009926
  }

  code .preprocessor {
      color: #999;
      font-weight: 700
  }

  code .deletion {
      background: #fdd;
      display: block
  }

  code .addition {
      background: #dfd;
      display: block
  }
}