To set rounded border to input box, use .round class and
to set square border to input box, use .sqaure class alongwith .form-control class.
For Flating Label Inputs, need to use .form-label-group class & add attribute disabled for disabled Floating Label Input.
You can indicate invalid and valid form fields with .is-invalid and .is-valid. Note that .invalid-feedback is also supported with these classes.
.{valid/invalid}-feedback classes for .{valid/invalid}-tooltip classes to display validation feedback in a styled tooltip.
For Input Box with left side icon, use class .has-icon-left and for use divider between icon and input text box use .input-divider-left or .input-divider-right for left and right divider respectively.
For different sizes of Input, Use classes like .form-control-lg & .form-control-sm for Large, Small input box.
For different sizes of Input, Use classes like .form-control-lg & .form-control-sm for Large, Small input box.