Fix over-sized focus on "print-table" button
Fix over-sized focus on "print-table" button

Fixes #206, in which the 'print table' button has an over-large orange
background when it has focus. The orange styling comes from the GDS
stylesheet, so the main fix here was to ensure that the button was
correctly positioned and sized.

epimorphics/ukhpi,epimorphics/ukhpi,epimorphics/ukhpi,epimorphics/ukhpi