You can change the style of an Alert window [duplicated]

You can not. The alert window is native to the browser and the style can not be changed. You could create your own or perhaps download a plugin which can make your life easier.

You could use SweetAlert , it's very easy to learn and has nice design (although you can also give it your own style).

Here is another one called jQuery-confirm

Find the one that best suits your needs and tastes.

As Comrade Hoose says, you can use SweetAlert . Very easy to implement and customize.

You add the necessary files and work.

<script src="dist/sweetalert.min.js"></script>
<link rel="stylesheet" type="text/css" href="dist/sweetalert.css">

And to work.

swal("Hello world!");