Welcome to my Bootstrap 4 website tutorial! Bootstrap is a free and open-source front-end library with HTML and CSS based designs.
Built with the latest version of HTML, HTML5.
Built with the latest version of Boostrap, Boostrap 4.
Built with the latest version of CSS, CSS3.
The columns will automatically stack on top of each other when the screen is less than 576px wide.
Resize the brpwser window to see the effect. Responsive web design has become more important as the amount of mobile traffic now accounts for more than half of total internet traffic.
It can also display the web page differently depending on the screen size or viewing device.
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