Input groups
Easily extend form controls by adding text, buttons, or button groups on either side of textual inputs, custom selects, and custom file inputs.
Add the relative form sizing classes to the .input-group
itself and contents within will automatically resize—no need for repeating the form control size classes on each element.
Place any checkbox option within an input group's addon instead of text.
Place any radio option within an input group's addon instead of text.