Now we want to change website more style so normal alert box is not good to see so in this case we want to change it.
There are some library which help you a lot. This is some link which you can use

Option 1: You can use

There are lot of option to customize it. hope you will like it

Option 2 : you can also use

This is very cool and more option to customize

If you need any help then please inform me, i will try to help you