fix(panels): remove unwanted whitespace under panels
fix(panels): remove unwanted whitespace under panels

fixes #274
[fixes #105701926]

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