Please try to change your screen resolution. Doing this has helped some people in the past along with clearing the cache on your laptop or trying a different browser like Firefox etc.
A work around you might also try: When you get the white box, move your cursor around. At some point around the left side in the middle, your cursor will change from an arrow to what you normally get over a dialogue box (a little hand or changed cursor). Click here and type in the code. If you can copy paste the code in, it will prevent errors. Then move to the bottom right and your cursor will change again when you get over the “ok” button. Click on that area. It should get you in.
Thank you for your patience.
