This ensures that the resize tests do not depend on the values set in
the CSS files.
Note that this change causes a test to fail with Firefox, but not with
PhantomJS. This is due to a difference in the starting width used by
Firefox and by PhantomJS, and it will be fixed in a following commit.
Signed-off-by: Daniel Calviño Sánchez <danxuliu@gmail.com>
29c924f74b