fix(alerts): remove unwanted top margin on alerts
fix(alerts): remove unwanted top margin on alerts

fixes #278
[fixes #105783386]

pivotal-cf/pivotal-ui,sjolicoeur/pivotal-ui,pivotal-cf/pivotal-ui,sjolicoeur/pivotal-ui,sjolicoeur/pivotal-ui,sjolicoeur/pivotal-ui,pivotal-cf/pivotal-ui