window.addEventListener('DOMContentLoaded', function() {
for (var i=0; i<picture.length; i++) {
picture[i].addEventListener('click', function() {
bigPicture.classList.remove('hidden');
});
}
});
window.addEventListener('load', function() {
for (var i=0; i<picture.length; i++) {
picture[i].addEventListener('click', function() {
bigPicture.classList.remove('hidden');
});
}
});