Flex elements ignore percent padding in Firefox
See https://lists.w3.org/Archives/Public/www-style/2015Sep/0038.html Grid/Flex Percentages The group tried to work through how vertical percentage margins and paddings are defined. Note: Top and bottom margins in CSS have traditionally resolved against the containing block width instead of its height, which has some useful effects but is generally surprising. Existing layout modes must of course continue to do … Read more