npm install @wepy/compiler-postcss --save

const cssnext = require('cssnext');

module.exports = {
    "compilers": {
        postcss: {
            plugins: [
                cssnext({
                    browsers:['iOS 9', 'Android 4.4']
                })
            ],
            map: {
                inline: true
            }
        },
    }
};