Flip page on click with CSS (and basics JS)

Have been following the workshop from Maikel Putman. I have created the div that contains the one page of the book. Used CSS to style it and used some transitions and transform to make it look 3d. Have also added an event listener with JavaScript that also knows on what half of the page you clicked. Next step will be to make this flip to the next page which still needs to be added in the HTML file.
