Bootstrap is an open-source front-end library with HTML and CSS based designs. This website is built with HTML5, CSS3 and Bootstrap 4.
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HTML5 is the fifth and current major version of the HTML standard, and subsumes XHTML.
Bootstrap is an open-source front-end library with HTML and CSS based designs.
CSS3 is the latest evolution of the Cascading Style Sheets language and aims at extending CSS2.
The columns will automatically stack on top of each other when the screen is less than 992px wide.
Resize the browser 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.
Bootstrap Course