Google Drive images on website

I have been given a number of pdf files that my clients want to display on their website as embedded objects rather than links. I have used Google Drive for this purpose, but the result is not a full display, but rather a small image to the left and a full image than requires the use of the up and down arrows to read – not really what I hoped for. I can move the smaller image using the arrow, but it makes no difference to the main image. The link below will show what I mean

http://public.epilepsy-wales.org.uk/?page_id=850

Any advice would be very welcome!