fix(style) : Setting section success messages border color (#5884) r=@vladikoff
fix(style) : Setting section success messages border color (#5884) r=@vladikoff

fixes mozilla/fxa#272
mozilla/fxa-content-server,shane-tomlinson/fxa-content-server,shane-tomlinson/fxa-content-server,shane-tomlinson/fxa-content-server,mozilla/fxa-content-server,mozilla/fxa-content-server