remove white space between navbar and body
remove white space between navbar and body

bkmorimoto/survey-gorilla,bkmorimoto/survey-gorilla,nyc-rock-doves-2015/asian_power_survey_gorilla,nyc-rock-doves-2015/asian_power_survey_gorilla,bkmorimoto/survey-gorilla,nyc-rock-doves-2015/asian_power_survey_gorilla