Almost...
After following Ron's suggestions, I was able to decrease the size of the margin on the right. However, with margins set to 0, I still get a thin strip of white.
A hack was to click page layout, which showed me that the white margin flanked two cells. Adjusting the size of one of these cells such that the split was in between each decreased the right margin further - to a few points. Not perfect, but good enough for now.
If anyone has a better fix, do let me know. Cheers.
http://imgur.com/a/5Ou9r