Github user Leemoonsoo commented on the pull request: https://github.com/apache/incubator-zeppelin/pull/583#issuecomment-168020692 Thanks @r-kamath for the contribution. The reason in the beginning code editor has vertical bar was, to distinguish it from the output. If output has the same vertical bar, it's bit confusing. see this screenshot  And it 'simple' looknfeel designed to have minimal view, 'report' looknfeel designed to have clear dashboard/documentation like view, and i'm not sure it fits there. In this project, some GUI changes may suitable for some users but not for the others. We'll need to make a decision for those changes. To do that, how about we discuss and define some kind of GUI design guidelines / principles (e.g. https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=61328042) first ?
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