Fix Missing bottom line and padding for form headers

What does this MR do?

Fix Missing bottom line and padding for form headers

Are there points in the code the reviewer needs to double check?

Make sure this doesn't create any side effects

Why was this MR needed?

Screenshots (if relevant)

Before After
Screen_Shot_2018-06-04_at_9.46.54_PM Screen_Shot_2018-06-04_at_9.48.15_PM

Does this MR meet the acceptance criteria?

What are the relevant issue numbers?

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/47277

Merge request reports

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