Basic example
Place one add-on or button on either side of an input. You may also place one on both sides of an input.
$ .00
With textarea

$ 0.00
$ 0.00
First and last name
Input Group Sizing
Add sizing class .input-group-sm, .input-group-lg
Input Group Options
Input Group with more options like Button, Button with Dropdown, Colors, Checkbox & with Radio

Mantis Customizer