log(msg, autoHide = true) {
    this._id && clearTimeout(this._id);

    this.el.textContent = msg;
    this.el.classList.add('lh-show');
    if (autoHide) {
      this._id = setTimeout(() => {
        this.el.classList.remove('lh-show');
      }, 7000);
    }
  }
Shows a butter bar.
@param {string} msg The message to show.
@param {boolean=} autoHide True to hide the message after a duration.
    Default is true.