To set rounded border to input box, use .rounded class alongwith .form-control class.
To set square border to input box, use .rounded-0 class alongwith .form-control class.
To make label in center of form-control, use .col-form-label class with <label> element. This is default bootstrap class.
use .form-label-group class & add attribute disabled for disabled Input.
For different sizes of Input, Use classes like .form-control-lg & .form-control-sm for Large, Small input box.
You can indicate invalid and valid form fields with .is-invalid and .is-valid. Note that .invalid-feedback is also supported with these classes.
