code: function stringify(obj) {
    return Object.keys(obj || {})
      .reduce(function(str, prop){
        return str += ''
          + (str ? ' ' : '')
          + prop
          + ': '
          + obj[prop]
          + ';';
      }, '');
  }
docs: Stringify `obj` to styles.
  
  @param {Object} obj
  @return {Object}
  @api private