Closes #3874 by setting a proper CSS style for the frame in question.
Closes #3874 by setting a proper CSS style for the frame in question.

damianmoore/shotwell,Sanva/shotwell-gsoc,damianmoore/shotwell,Sanva/shotwell-gsoc,jof/shotwell,jimbonator/shotwell,h4ck3rm1k3/shotwell,jimbonator/shotwell,abrauchli/shotwell,ritchiewilson/shotwell,jimbonator/shotwell,abrauchli/shotwell,abrauchli/shotwell,h4ck3rm1k3/shotwell,polymeris/shotwell,polymeris/shotwell,ritchiewilson/shotwell,jof/shotwell,ritchiewilson/shotwell,damianmoore/shotwell,jof/shotwell,polymeris/shotwell,Sanva/shotwell-gsoc,h4ck3rm1k3/shotwell