postcss-increase-specificity.js

const postcss = require('postcss');

const PREFIX = 'html ';
const SUFFIX = '';

module.exports = postcss.plugin('postcss-increase-weight', () =>
    css =>
        css.walkRules(rule => {
            rule.selectors = rule.selectors.map(
                selector => `${PREFIX}${selector}${SUFFIX}`
            );
        })
);