Button Example:


```js
onSubmitPrimaryButton =(e) =>{
    e.target.classList.toggle('is-loading');
}
onSubmitSecondaryButton =(e) =>{
    e.target.classList.toggle('is-loading');
}
onSubmitTertiaryButton =(e) =>{
    e.target.classList.toggle('is-loading');
}
<div>
<h5>Primary Default field:</h5><br/>
<Button value="Submit" buttonType="primary" onClick={this.onSubmitPrimaryButton}/>
<Button value="Submit" buttonType="primary" disabled /><br/>
<h5>Secondary Default field:</h5><br/>
<Button value="Submit" buttonType="secondary" onClick={this.onSubmitSecondaryButton}  />
<Button value="Submit" buttonType="secondary" disabled onClick={this.onSubmitSecondaryButton}  /><br/>
<h5>Tertiary Default field:</h5><br/>
<Button value="Submit" buttonType="tertiary" />
<Button value="Submit" buttonType="tertiary" disabled />
<br/>
<h5>Quartenary Default field:</h5><br/>
<Button value="Submit" buttonType="quaternary" /> 
<Button value="Submit" buttonType="quaternary" disabled /> <br/>
<h5>Ghost Default Field:</h5><br/>
<Button value="Delete" buttonType="ghost" /> 
<Button value="Delete" buttonType="ghost" disabled /> 

</div>
```