Fix jobs log background color

What does this MR do?

Fix jobs log background color

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

Why was this MR needed?

Screenshots (if relevant)

Before After
Screen_Shot_2018-06-04_at_10.09.53_PM Screen_Shot_2018-06-04_at_10.08.58_PM

Does this MR meet the acceptance criteria?

What are the relevant issue numbers?

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/47261

Edited by Filipa Lacerda

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