let scrollPosition = 0;

function clickToView() {
	if (scrollPosition === 0) {
		scrollPosition = window.scrollY;
		window.scrollTo(0, 0);
	}

	this.classList.toggle('clicked-image');
	document.body.classList.toggle('body-on-clicked-image');

	if (!this.classList.contains('clicked-image')) {
		window.scrollTo(0, scrollPosition);
		scrollPosition = 0;
	}
}

const images = document.getElementsByTagName('img');

for (const image of images) {
	if (image.alt !== '🔗' && !image.classList.contains('unzoomable')) {
		image.onclick = clickToView;
	}
}