function Root(opts) {
	    var _this;
	    _this = _Container.call(this, opts) || this;
	    _this.type = _types.ROOT;
	    return _this;
	  }
Return the most specific node at the line and column number given.
The source location is based on the original parsed location, locations aren't
updated as selector nodes are mutated.

Note that this location is relative to the location of the first character
of the selector, and not the location of the selector in the overall document
when used in conjunction with postcss.

If not found, returns undefined.
@param {number} line The line number of the node to find. (1-based index)
@param {number} col  The column number of the node to find. (1-based index)