no more, no less; that's exactly it
Used to emphasize that something is exactly as stated, without exaggeration or understatement. Often follows a statement to assert its completeness or accuracy.
His explanation was no more and no less than that.
This movie is a masterpiece. That's all there is to it.
A fixed expression composed of それ (that), 以上 (more than), 以下 (less than), and the negative copula ではない. Literally 'it is not more than that nor less than that'.