Arpit Anand

How to create and apply CSS to JavaScript Alert box?

Arpit Anand

Updated on 15-Mar-2026 8K+ Views

The standard alert box in JavaScript does not provide the option to apply CSS. To style your alert box, you need to create a custom one first. The custom alert box will be created using jQuery and styles will be applied to CSS. Why Custom Alert Boxes? JavaScript's built-in alert() function creates browser-native dialogs that cannot be styled. Custom alert boxes give you complete control over appearance, animations, and user experience. Example You can try to run the following code to learn how to create and apply CSS to alert box: ...