turn.js hidden div element

Question

I'm currently working on the Steve Jobs turn.js sample like.

I'm having an issue adding content to the pages because many of the div elements I'm working with are hidden.

So far I have tried to add content via CSS because I can see the hidden div elements when inspecting. The problem is that I can't customise or add new classes to work with the pages.

I also tried commenting out the "hide canvas":

// Show canvas

    $('#canvas').css({
        visibility: ''
    });
}

// // Hide canvas

// $('#canvas').css({
//     visibility: 'hidden'
// });

Does anyone have an idea on how to work with the hidden div elements.