Added class

src/components/Modal/ModalButton.tsx

@@ -13,6 +13,7 @@ interface Props {
   design?: 'bu-primary' | 'bu-link' | 'bu-info' | 'bu-success' | 'bu-warning' | 'bu-danger' | 'bu-dark' | 'bu-light' | 'bu-text' | 'bu-ghost' | 'bo-primary' | 'bo-secondary' | 'bo-success' | 'bo-danger' | 'bo-warning' | 'bo-info' | 'bo-light' | 'bo-dark' | 'bo-link'
   width?: number
   wide?: boolean
+  class?: string
 }
 
 export default (props: Props) => {