`<InputGroupButton />` component example:

```js
import {
  InputGroup,
  Input,
  InputGroupButton,
} from '$PACKAGE_NAME';


<InputGroup>
  <InputGroupButton>
    I'm a button
  </InputGroupButton>
  <Input />
</InputGroup>
```

```js
import {
  InputGroup,
  Input,
  InputGroupButton,
} from '$PACKAGE_NAME';

<InputGroup>
  <InputGroupButton color="danger">To the Left!</InputGroupButton>
  <Input placeholder="and..." />
  <InputGroupButton color="success">To the Right!</InputGroupButton>
</InputGroup>
```
