Today we will learn how to design an alert component by combining HTML, CSS, Javascript and Bootstrap.
Alert Bootstrap
- Announce the results of an action or event. For example, if a user registers as a member, we should use alert to notify the user that the registration is successful or an error has occurred.
- Alerts from the website system to provide information to users such as system maintenance coming soon, a function coming soon, etc.
- Confirm some risky action on the website. For example, when you go to an unsafe website, Google will give you a warning and you will have two options: go ahead or not visit that site anymore.
- Help you increase the ability to connect with potential customers with email registration notification templates to receive new products, new articles...

Jquery Alert Popup Example:

You can see the codepen results below.
See the Pen Modern Alerts by MohammadReza keikavousi (@keikaavousi) on CodePen.
Message box in HTML CSS:

You can see the codepen results below.
See the Pen Daily UI#011 | Flash Message (Error/Success) by Julie Park (@juliepark) on CodePen.
Material UI Message Box:
You can see the codepen results below.
See the Pen UI -Material Design alerts by Renan Pupin (@renanpupin) on CodePen.
Alert in Javascript Example:

You can see the codepen results below.
See the Pen Alerts Component by Travis John (@travis_john) on CodePen.
Alert Message in HTML:

You can see the codepen results below.
See the Pen Notifications by Keith Pickering (@keithpickering) on CodePen.
Customize Javascript Alert Box CSS:

You can see the codepen results below.
See the Pen Pop-Up Overlay by Aaron Taylor (@BeanBaag) on CodePen.
Custom Alert Popup:

You can see the codepen results below.
See the Pen Bootstrap Alert Tests by Henrijs Kons (@LAUVz) on CodePen.
Bootstrap Alert Popup:

You can see the codepen results below.
See the Pen #011 Flash Message by Andre Wichert (@andrewichert) on CodePen.
Bootstrap Alert on Button Click :

You can see the codepen results below.
See the Pen Flash Messages - 100 Accessible UI Challenge by Maxwell Antonucci (@max1128) on CodePen.
JavaScript alert box CSS design:

You can see the codepen results below.
See the Pen Simple css alerts by Stanislav (@golcinho) on CodePen.
HTML Message Box:

You can see the codepen results below.
See the Pen UI Alert CSS by Nirajan Basnet (@nirazanbasnet) on CodePen.
Summary
I hope the article will help you shorten the time in choosing alert css for the website and if you have any questions, just send an email and I will respond as soon as possible. I hope you continue to support the site so that I can write more good articles. Have a nice day!