Regression: Public-facing contribution pages appearance changes on 4.7.31

This is best expressed with screenshots. The first screenshot is 4.7.29 (sorry I don't have an easy 4.7.30 pic to show). The second screenshot is 4.7.31. This is replicable on the demo and I've noted the issue on Drupal, Backdrop and WP sites alike.

https://github.com/civicrm/civicrm-core/pull/11827

closed

mentioned in issue #36 (closed)

mentioned in issue #65 (closed)

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mentioned in issue #2089 (closed)

mentioned in issue #2377 (closed)

mentioned in issue #2493 (closed)

mentioned in commit 081629dc

mentioned in issue #3698 (closed)

mentioned in issue #4267

mentioned in issue #4390 (closed)

mentioned in issue #5284 (closed)