Material Design & Bootstrap 4 using HTML CSS -

當在用於觸發頁面內功能（例如折疊內容），而不是連結到新頁面或當前頁面中某一部分的 a> 元素上使用按鈕class 時，這些連結應該被賦予 role=button 以適當地傳達他們的

This component already includes several predefined button styles, each serving its own semantic purpose, with a few extras thrown in for more control You can

bootstrap card Best Practices for easy use of Bootstrap Buttons Styles · Default · Primary · Success · Info · Warning

bootstrap modal With a set of free and creative Bootstrap buttons, you can spice up the experience of your web project easily and comfortably