For example, extract ant-design's color theme (V4) in
- https://github.com/ant-design/ant-design/blob/c73b9a7/components/style/themes/default.less
- https://github.com/ant-design/ant-design/blob/c73b9a7/components/style/themes/dark.less
git clone [email protected]:ant-design/ant-design.git
cd ant-design
# read from stdin