Replace prepend-top-20 in devise/

Jose Ivan Vargasrequested to merge
jivanvl-replace-prepend-top-20-devise into master

What does this MR do?

This replaces the prepend-top-20 class inside the boards app

#287688

Screenshots (strongly suggested)

Before After with gl-mt-6
Screen_Shot_2020-11-24_at_12.50.56 Screen_Shot_2020-11-24_at_12.52.46

Screen_Shot_2020-11-24_at_12.53.37

Does this MR meet the acceptance criteria?

Conformity

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