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html - Bootstrap: Input text border turning black before applying CSS-applied grey? - Stack Overflow
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css - (Bootstrap 4) Card borders rendered bad/different when used together with bg-color - Stack Overflow
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Missing border radius on input group with validation feedback · Issue #25110 · 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/2zJtR.png)