How To Change Button Style Inside JavaScript Bootstrap table

How can i change button style inside JavaScript for bootstrap table?

`
$(document).ready(function() {
var table = $(‘#example’).DataTable();

new $.fn.dataTable.Buttons( table, {
    buttons: [
        {
            text: 'Button 1',
            action: function ( e, dt, node, conf ) {
              alert( 'Button activated' );
            }
        },
        {
            text: 'Button 2',
            action: function ( e, dt, node, conf ) {
              alert( 'Button activated' );
            }
        }
    ]
} );

table.buttons( 0, null ).container().prependTo(
    table.table().container()
);

} );
`

I have no idea at all how to styling that button. Thanks for your help