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Option to remove the thick bottom border from `thead` and top border from `tfoot` in table element · Issue #35342 · twbs/bootstrap · GitHub
![css - (Bootstrap 4) Card borders rendered bad/different when used together with bg-color - Stack Overflow css - (Bootstrap 4) Card borders rendered bad/different when used together with bg-color - Stack Overflow](https://i.stack.imgur.com/w51je.png)
css - (Bootstrap 4) Card borders rendered bad/different when used together with bg-color - Stack Overflow
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Tabs border color on card header should be match the card border color? · Issue #28837 · twbs/bootstrap · GitHub
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Bootstrap 5.1/5.2 Introduce CSS variables, but they don't work in emails. · twbs · Discussion #37511 · GitHub
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