function addStyle(content) {
  var target = document.head || document.getElementsByTagName('head')[0];
  var node = document.createElement("style");
  node.innerHTML = content;
  target.appendChild(node);
}

function curry(func) {
  return function curried(...args) {
    if (args.length >= func.length) {
      return func.apply(this, args);
    } else {
      return function(...args2) {
        return curried.apply(this, args.concat(args2));
      }
    }
  };
}