Lightbox reduce the image when you click on it, how to do?

Question

Lightbox

Hello, I want to modify the lightbox a little, at the moment it works like this, click on the picture, it has increased, to close you need to click on any space but not on the picture, or on the cross, how to implement it so that by clicking on the picture it closes? just by clicking on the open image.
The lightbox js did not fit here, I added it at
hastebin.com/uvafezajut.js