in sweetalert how to change background color in button

Question

<link href="~/bootstrap-3.3.6-dist/sweetAlert/sweetalert.css" rel="stylesheet" />
<script src="~/bootstrap-3.3.6-dist/sweetAlert/sweetalert.js"></script>
<script src="~/scripts/jquery-3.0.0.min.js"></script>
<script src="~/bootstrap-3.3.6-dist/sweetAlert/sweetalert.min.js"></script>
<link href="~/bootstrap-3.3.6-dist/css/bootstrap.min.css" rel="stylesheet" />
<script src="~/bootstrap-3.3.6-dist/sweetAlert/bootstrap.js"></script>
<script src="~/bootstrap-3.3.6-dist/sweetAlert/bootstrap.min.js"></script>
swal({
title: "Are you sure?",
text: "Are you sure that you want to delete this course " + div + "?",
type: "warning",
showCancelButton: true,
closeOnConfirm: false,
confirmButtonText: "Yes, delete it!",
confirmButtonColor: "btn-danger",
cancelButtonText: "No, cancel !",
cancelButtonColor: "btn-light"
},
function (d1) {
if (d1) {}

that button doest not works how to fix

 

i want to change color background in button

 

please how to do