document.documentElement.clientHeight\n\n    if (!this._isBodyOverflowing && isModalOverflowing) {\n      this._element.style.paddingLeft = `${this._scrollbarWidth}px`\n    }\n\n    if (this._isBodyOverflowing && !isModalOverflowing) {\n      this._element.style.paddingRight = `${this._scrollbarWidth}px`\n    }\n  }\n\n  _resetAdjustments() {\n    this._element.style.paddingLeft = ''\n    this._element.style.paddingRight = ''\n  }\n\n  _checkScrollbar() {\n    const rect = document.body.getBoundingClientRect()\n...