there is not a part of html or css so you cannot change it anymore. here for refrence
possible but you need to create a custom alert dialog
https://tutorialzine.com/2010/12/better-confirm-box-jquery-css3
You may with HTML5 which permits you to create your own customized dialog boxes, as the following example illustrates:
HTML:
<dialog open id="favDialog">
<form method="dialog">
<section>
<p>Leave this site?</p>
</section>
<menu>
<button id="cancel" type="reset">No</button>
<button type="submit">Yes</button>
</menu>
</form>
</dialog>
See live code
This code to date is only supported by a couple of the major browsers, namely Chrome 37 and Opera 24 (see more details here ).
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