MB-12623: make UI more wide

Change-Id: I2709a4133bceed8d515ec257fc635293dd498f6f
Reviewed-on: http://review.couchbase.org/43133
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>