Input group addons

Extend form controls by adding text or buttons before, after, or on both sides of any text-based <input>. Use .input-group with an .input-group-addon to prepend or append elements to a single .form-control. Place one add-on or button on either side of an input. You may also place one on both sides of an input. Multiple add-ons on a single side and multiple form-controls in a single input group aren't supported.