![html - Bootstrap-4 validation: Add border and background-color to form input -group - Stack Overflow html - Bootstrap-4 validation: Add border and background-color to form input -group - Stack Overflow](https://i.stack.imgur.com/qil8y.png)
html - Bootstrap-4 validation: Add border and background-color to form input -group - Stack Overflow
![InputGroup> borders do not fully highlight when clicking in <Input> form field · Issue #12 · creativetimofficial/ct-black-dashboard-pro-react · GitHub InputGroup> borders do not fully highlight when clicking in <Input> form field · Issue #12 · creativetimofficial/ct-black-dashboard-pro-react · GitHub](https://user-images.githubusercontent.com/205420/57925486-63f53880-7876-11e9-809f-df0d4100526f.png)
InputGroup> borders do not fully highlight when clicking in <Input> form field · Issue #12 · creativetimofficial/ct-black-dashboard-pro-react · GitHub
![invalid-feedback doesn't show for .input-group with an invalid control · Issue #23454 · twbs/bootstrap · GitHub invalid-feedback doesn't show for .input-group with an invalid control · Issue #23454 · twbs/bootstrap · GitHub](https://user-images.githubusercontent.com/98681/77345305-aaff5600-6cf1-11ea-8cff-136883f5ae11.png)