I believe we can get the sizes we want, proportional to the default font size settings in about:welcome, by setting `font-size: 0.83em` on the migration-wizard element. Bug 1829733 should also bring the checkbox spacing closer to the spec.
Bug 1829039 Comment 1 Edit History
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I believe we can get the sizes we want, proportional to the default font size settings in about:welcome, by setting `font-size: 0.83em` on the migration-wizard element within the about:welcome CSS. Bug 1829733 should also bring the checkbox spacing closer to the spec.