Changed the calculation of the iframe size so it would be the correct
height. Altered the styles of the view details area to match design.
Changed the background color of the title on the file header so it
wouldn't look editable (as recommended by Felipe)
It hardcodes a width too globally, and uses magic numbers rather than the $grid-x system.
Also, it breaks styling, e.g. in the 'insert image' dialog.
This reverts commit 050afddc8e.
