How to customize the position of an alert box using JavaScript?

JavascriptWeb DevelopmentFront End Technology

To customize the position of an alert box, use the CSS “top” and “left” properties. We have a custom alert box, which we’ve created using jQuery and styled with CSS.


You can try to run the following code to customize the position of an alert box −

Live Demo

<!DOCTYPE html>
      <script src=""></script>
         function functionAlert(msg, myYes) {
            var confirmBox = $("#confirm");
            confirmBox.find(".yes").unbind().click(function() {
         #confirm {
            display: none;
            background-color: #F3F5F6;
            color: #000000;
            border: 1px solid #aaa;
            position: fixed;
            width: 300px;
            height: 100px;
            left: 30%;
            top: 30%;
            box-sizing: border-box;
            text-align: center;
         #confirm button {
            background-color: #FFFFFF;
            display: inline-block;
            border-radius: 12px;
            border: 4px solid #aaa;
            padding: 5px;
            text-align: center;
            width: 60px;
            cursor: pointer;
         #confirm .message {
            text-align: left;
      <div id="confirm">
         <div class="message">This is a warning message.</div><br>
         <button class="yes">OK</button>
      <input type="button" value="Click Me" onclick="functionAlert();" />
Updated on 16-Jun-2020 12:45:56